51664072137508 has 24 divisors (see below), whose sum is σ = 91319963180544. Its totient is φ = 25572725052000.

The previous prime is 51664072137499. The next prime is 51664072137511. The reversal of 51664072137508 is 80573127046615.

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, 5953860 + ... + 11780347.

It is an arithmetic number, because the mean of its divisors is an integer number (3804998465856).

Almost surely, 2^{51664072137508} is an apocalyptic number.

It is an amenable number.

51664072137508 is a deficient number, since it is larger than the sum of its proper divisors (39655891043036).

51664072137508 is a wasteful number, since it uses less digits than its factorization.

51664072137508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17741523 (or 17741521 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 51664072137508 in words is "fifty-one trillion, six hundred sixty-four billion, seventy-two million, one hundred thirty-seven thousand, five hundred eight".