15500478656 has 56 divisors (see below), whose sum is σ = 34267109520. Its totient is φ = 6907364352.

The previous prime is 15500478649. The next prime is 15500478667. The reversal of 15500478656 is 65687400551.

It is a super-2 number, since 2×15500478656² (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 15500478656.

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, 297086 + ... + 345341.

It is an arithmetic number, because the mean of its divisors is an integer number (611912670).

Almost surely, 2^15500478656 is an apocalyptic number.

15500478656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15500478656 is an abundant number, since it is smaller than the sum of its proper divisors (18766630864).

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

15500478656 is a wasteful number, since it uses less digits than its factorization.

15500478656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642481 (or 642471 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 15500478656 in words is "fifteen billion, five hundred million, four hundred seventy-eight thousand, six hundred fifty-six".