15901497972 has 18 divisors (see below), whose sum is σ = 40195453298. Its totient is φ = 5300499312.

The previous prime is 15901497967. The next prime is 15901498003. The reversal of 15901497972 is 27979410951.

15901497972 is a `hidden beast` number, since 1 + 590 + 1 + 49 + 7 + 9 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14387042916 + 1514455056 = 119946^2 + 38916^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×15901497972² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220854103 + ... + 220854174.

Almost surely, 2^15901497972 is an apocalyptic number.

15901497972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15901497972 is an abundant number, since it is smaller than the sum of its proper divisors (24293955326).

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

15901497972 is a wasteful number, since it uses less digits than its factorization.

15901497972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441708287 (or 441708282 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 15901497972 in words is "fifteen billion, nine hundred one million, four hundred ninety-seven thousand, nine hundred seventy-two".