51015665516 has 6 divisors (see below), whose sum is σ = 89277414660. Its totient is φ = 25507832756.

The previous prime is 51015665507. The next prime is 51015665539. The reversal of 51015665516 is 61556651015.

51015665516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6376958186 + ... + 6376958193.

It is an arithmetic number, because the mean of its divisors is an integer number (14879569110).

Almost surely, 2^51015665516 is an apocalyptic number.

It is an amenable number.

51015665516 is a deficient number, since it is larger than the sum of its proper divisors (38261749144).

51015665516 is a wasteful number, since it uses less digits than its factorization.

51015665516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12753916383 (or 12753916381 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 51015665516 in words is "fifty-one billion, fifteen million, six hundred sixty-five thousand, five hundred sixteen".