99172688372 has 12 divisors (see below), whose sum is σ = 173557228740. Its totient is φ = 49584908736.

The previous prime is 99172688359. The next prime is 99172688399. The reversal of 99172688372 is 27388627199.

99172688372 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 53938204516 + 45234483856 = 232246^2 + 212684^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195113 + ... + 486224.

It is an arithmetic number, because the mean of its divisors is an integer number (14463102395).

Almost surely, 2^99172688372 is an apocalyptic number.

It is an amenable number.

99172688372 is a deficient number, since it is larger than the sum of its proper divisors (74384540368).

99172688372 is a wasteful number, since it uses less digits than its factorization.

99172688372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717730 (or 717728 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 62.

The spelling of 99172688372 in words is "ninety-nine billion, one hundred seventy-two million, six hundred eighty-eight thousand, three hundred seventy-two".