15697778680 has 32 divisors (see below), whose sum is σ = 35371178640. Its totient is φ = 6270013440.

The previous prime is 15697778669. The next prime is 15697778687. The reversal of 15697778680 is 8687779651.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15697778687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256329 + ... + 311608.

Almost surely, 2^15697778680 is an apocalyptic number.

15697778680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15697778680 is an abundant number, since it is smaller than the sum of its proper divisors (19673399960).

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

15697778680 is a wasteful number, since it uses less digits than its factorization.

15697778680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568639 (or 568635 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 64.

The spelling of 15697778680 in words is "fifteen billion, six hundred ninety-seven million, seven hundred seventy-eight thousand, six hundred eighty".