Short answers, pulled from the story.
Lalitavistara has been translated as "The Play in Full" or "Extensive Play." The name reflects the Mahayana view that the Buddha's last incarnation was a display or performance given for the benefit of all beings in this world.
The Lalitavistara Sutra tells the story of Gautama Buddha from his descent from the Tushita heaven through his birth, education, renunciation, and six years of asceticism, to his awakening under the Bodhi Tree and his first sermon at Deer Park near Varanasi. The narrative spans twenty-seven chapters.
P. L. Vaidya dated the finished Sanskrit text to the third century AD. The sutra is understood to be a compilation drawing on sources from the Sarvastivada and Mahayana traditions, some of which belong to the very early days of the Buddhist tradition.
The Lalitavistara Sutra is depicted in stone relief panels at Borobudur. Vajrayana practitioners who built the monument had stonemasons illustrate the sutra's account of the Buddha's life, from his descent from Tushita heaven to his first sermon at Deer Park.
Three major English translations exist. R. L. Mitra produced a translation in 1875. Gwendolyn Bays translated the text in 1983 as a two-volume set titled Voice of the Buddha: The Beauty of Compassion, working from French and checking against Tibetan and Sanskrit. The Dharmachakra Translation Committee produced a translation titled The Play in Full in 2013 under the patronage of 84000: Translating the Words of the Buddha.
In the Lalitavistara Sutra, the Buddha explains to a mathematician named Arjuna a system of numerals expressed in multiples of one hundred. The sequence starts from a koti and extends to a tallakshana, which the text places at ten to the power of fifty-three.