99217591972912 has 160 divisors (see below), whose sum is σ = 232835003856000. Its totient is φ = 40050765619200.

The previous prime is 99217591972909. The next prime is 99217591972931. The reversal of 99217591972912 is 21927919571299.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2043971362 + ... + 2044019902.

It is an arithmetic number, because the mean of its divisors is an integer number (1455218774100).

Almost surely, 2^{99217591972912} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99217591972912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116417501928000).

99217591972912 is an abundant number, since it is smaller than the sum of its proper divisors (133617411883088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99217591972912 is a wasteful number, since it uses less digits than its factorization.

99217591972912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63975 (or 63969 counting only the distinct ones).

The product of its digits is 115736040, while the sum is 73.

The spelling of 99217591972912 in words is "ninety-nine trillion, two hundred seventeen billion, five hundred ninety-one million, nine hundred seventy-two thousand, nine hundred twelve".