15997637568 has 112 divisors (see below), whose sum is σ = 48891285504. Its totient is φ = 4562595840.

The previous prime is 15997637563. The next prime is 15997637611. The reversal of 15997637568 is 86573679951.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 15997637499 and 15997637508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997637561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186880 + ... + 258687.

Almost surely, 2^15997637568 is an apocalyptic number.

It is an amenable number.

15997637568 is an abundant number, since it is smaller than the sum of its proper divisors (32893647936).

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

15997637568 is a wasteful number, since it uses less digits than its factorization.

15997637568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445610 (or 445600 counting only the distinct ones).

The product of its digits is 85730400, while the sum is 66.

The spelling of 15997637568 in words is "fifteen billion, nine hundred ninety-seven million, six hundred thirty-seven thousand, five hundred sixty-eight".