15901612864 has 28 divisors (see below), whose sum is σ = 33410927844. Its totient is φ = 7483111424.

The previous prime is 15901612763. The next prime is 15901612871. The reversal of 15901612864 is 46821610951.

It can be written as a sum of positive squares in 2 ways, for example, as 11440441600 + 4461171264 = 106960^2 + 66792^2 .

It is a super-2 number, since 2×15901612864² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15901612864.

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, 7306639 + ... + 7308814.

It is an arithmetic number, because the mean of its divisors is an integer number (1193247423).

Almost surely, 2^15901612864 is an apocalyptic number.

It is an amenable number.

15901612864 is an abundant number, since it is smaller than the sum of its proper divisors (17509314980).

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

15901612864 is a wasteful number, since it uses less digits than its factorization.

15901612864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14615482 (or 14615472 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 15901612864 in words is "fifteen billion, nine hundred one million, six hundred twelve thousand, eight hundred sixty-four".