51646305664 has 32 divisors (see below), whose sum is σ = 102944593440. Its totient is φ = 25809231360.

The previous prime is 51646305653. The next prime is 51646305679. The reversal of 51646305664 is 46650364615.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131662 + ... + 347314.

It is an arithmetic number, because the mean of its divisors is an integer number (3217018545).

Almost surely, 2^51646305664 is an apocalyptic number.

It is an amenable number.

51646305664 is a deficient number, since it is larger than the sum of its proper divisors (51298287776).

51646305664 is a wasteful number, since it uses less digits than its factorization.

51646305664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217538 (or 217526 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 51646305664 in words is "fifty-one billion, six hundred forty-six million, three hundred five thousand, six hundred sixty-four".