51646463556616 has 8 divisors (see below), whose sum is σ = 96837119168670. Its totient is φ = 25823231778304.

The previous prime is 51646463556577. The next prime is 51646463556619. The reversal of 51646463556616 is 61665536464615.

It can be written as a sum of positive squares in only one way, i.e., 48607529048100 + 3038934508516 = 6971910^2 + 1743254^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51646463556619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3227903972281 + ... + 3227903972296.

Almost surely, 2^{51646463556616} is an apocalyptic number.

It is an amenable number.

51646463556616 is a deficient number, since it is larger than the sum of its proper divisors (45190655612054).

51646463556616 is a wasteful number, since it uses less digits than its factorization.

51646463556616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455807944583 (or 6455807944579 counting only the distinct ones).

The product of its digits is 279936000, while the sum is 64.

The spelling of 51646463556616 in words is "fifty-one trillion, six hundred forty-six billion, four hundred sixty-three million, five hundred fifty-six thousand, six hundred sixteen".