51532065664 has 32 divisors (see below), whose sum is σ = 102707400600. Its totient is φ = 25754522112.

The previous prime is 51532065661. The next prime is 51532065709. The reversal of 51532065664 is 46656023515.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51532065664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51532065661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201382 + ... + 378970.

Almost surely, 2^51532065664 is an apocalyptic number.

It is an amenable number.

51532065664 is a deficient number, since it is larger than the sum of its proper divisors (51175334936).

51532065664 is a wasteful number, since it uses less digits than its factorization.

51532065664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179870 (or 179858 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 51532065664 in words is "fifty-one billion, five hundred thirty-two million, sixty-five thousand, six hundred sixty-four".