15615616556 has 12 divisors (see below), whose sum is σ = 27334103160. Its totient is φ = 7805872800.

The previous prime is 15615616547. The next prime is 15615616571. The reversal of 15615616556 is 65561651651.

It is a super-2 number, since 2×15615616556² (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 15615616556.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465641 + ... + 498048.

It is an arithmetic number, because the mean of its divisors is an integer number (2277841930).

Almost surely, 2^15615616556 is an apocalyptic number.

It is an amenable number.

15615616556 is a deficient number, since it is larger than the sum of its proper divisors (11718486604).

15615616556 is a wasteful number, since it uses less digits than its factorization.

15615616556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967744 (or 967742 counting only the distinct ones).

The product of its digits is 810000, while the sum is 47.

The spelling of 15615616556 in words is "fifteen billion, six hundred fifteen million, six hundred sixteen thousand, five hundred fifty-six".