99172394640 has 120 divisors (see below), whose sum is σ = 363331620288. Its totient is φ = 24041790720.

The previous prime is 99172394599. The next prime is 99172394669. The reversal of 99172394640 is 4649327199.

99172394640 is a `hidden beast` number, since 9 + 9 + 172 + 3 + 9 + 464 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6252964 + ... + 6268803.

Almost surely, 2^99172394640 is an apocalyptic number.

99172394640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99172394640 is an abundant number, since it is smaller than the sum of its proper divisors (264159225648).

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

99172394640 is a wasteful number, since it uses less digits than its factorization.

99172394640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12521797 (or 12521788 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 99172394640 in words is "ninety-nine billion, one hundred seventy-two million, three hundred ninety-four thousand, six hundred forty".