51665556056 has 8 divisors (see below), whose sum is σ = 96872917620. Its totient is φ = 25832778024.

The previous prime is 51665556053. The next prime is 51665556073. The reversal of 51665556056 is 65065556615.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 51665555995 and 51665556013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665556053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3229097246 + ... + 3229097261.

Almost surely, 2^51665556056 is an apocalyptic number.

It is an amenable number.

51665556056 is a deficient number, since it is larger than the sum of its proper divisors (45207361564).

51665556056 is a wasteful number, since it uses less digits than its factorization.

51665556056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458194513 (or 6458194509 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 51665556056 in words is "fifty-one billion, six hundred sixty-five million, five hundred fifty-six thousand, fifty-six".