12565551916 has 12 divisors (see below), whose sum is σ = 22526050680. Its totient is φ = 6129537440.

The previous prime is 12565551893. The next prime is 12565551967. The reversal of 12565551916 is 61915556521.

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, 38309446 + ... + 38309773.

It is an arithmetic number, because the mean of its divisors is an integer number (1877170890).

Almost surely, 2^12565551916 is an apocalyptic number.

It is an amenable number.

12565551916 is a deficient number, since it is larger than the sum of its proper divisors (9960498764).

12565551916 is a wasteful number, since it uses less digits than its factorization.

12565551916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76619264 (or 76619262 counting only the distinct ones).

The product of its digits is 405000, while the sum is 46.

The spelling of 12565551916 in words is "twelve billion, five hundred sixty-five million, five hundred fifty-one thousand, nine hundred sixteen".