15651591720 has 32 divisors (see below), whose sum is σ = 46954775520. Its totient is φ = 4173757760.

The previous prime is 15651591713. The next prime is 15651591743. The reversal of 15651591720 is 2719515651.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65214846 + ... + 65215085.

It is an arithmetic number, because the mean of its divisors is an integer number (1467336735).

Almost surely, 2^15651591720 is an apocalyptic number.

15651591720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15651591720 is an abundant number, since it is smaller than the sum of its proper divisors (31303183800).

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

15651591720 is a wasteful number, since it uses less digits than its factorization.

15651591720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130429945 (or 130429941 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 42.

The spelling of 15651591720 in words is "fifteen billion, six hundred fifty-one million, five hundred ninety-one thousand, seven hundred twenty".