15656220656 has 40 divisors (see below), whose sum is σ = 31559122944. Its totient is φ = 7515910080.

The previous prime is 15656220653. The next prime is 15656220673. The reversal of 15656220656 is 65602265651.

It is a super-2 number, since 2×15656220656² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15656220653) 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, 61280 + ... + 187263.

Almost surely, 2^15656220656 is an apocalyptic number.

15656220656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15656220656 is an abundant number, since it is smaller than the sum of its proper divisors (15902902288).

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

15656220656 is a wasteful number, since it uses less digits than its factorization.

15656220656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248709 (or 248703 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 15656220656 in words is "fifteen billion, six hundred fifty-six million, two hundred twenty thousand, six hundred fifty-six".