51604665002556 has 48 divisors (see below), whose sum is σ = 125369829963168. Its totient is φ = 16506890035200.

The previous prime is 51604665002483. The next prime is 51604665002567. The reversal of 51604665002556 is 65520056640615.

It is a junction number, because it is equal to n+sod(n) for n = 51604665002499 and 51604665002508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859703845 + ... + 859763868.

It is an arithmetic number, because the mean of its divisors is an integer number (2611871457566).

Almost surely, 2^{51604665002556} is an apocalyptic number.

It is an amenable number.

51604665002556 is an abundant number, since it is smaller than the sum of its proper divisors (73765164960612).

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

51604665002556 is a wasteful number, since it uses less digits than its factorization.

51604665002556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719467822 (or 1719467820 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 51.

The spelling of 51604665002556 in words is "fifty-one trillion, six hundred four billion, six hundred sixty-five million, two thousand, five hundred fifty-six".