51555605660556 has 48 divisors (see below), whose sum is σ = 120369422358528. Its totient is φ = 17174773008000.

The previous prime is 51555605660527. The next prime is 51555605660563. The reversal of 51555605660556 is 65506650655515.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51555605660556.

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, 520172901 + ... + 520272003.

It is an arithmetic number, because the mean of its divisors is an integer number (2507696299136).

Almost surely, 2^{51555605660556} is an apocalyptic number.

It is an amenable number.

51555605660556 is an abundant number, since it is smaller than the sum of its proper divisors (68813816697972).

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

51555605660556 is a wasteful number, since it uses less digits than its factorization.

51555605660556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124982 (or 124980 counting only the distinct ones).

The product of its (nonzero) digits is 101250000, while the sum is 60.

The spelling of 51555605660556 in words is "fifty-one trillion, five hundred fifty-five billion, six hundred five million, six hundred sixty thousand, five hundred fifty-six".