51499761264 has 90 divisors (see below), whose sum is σ = 167658897120. Its totient is φ = 14714215488.

The previous prime is 51499761263. The next prime is 51499761301. The reversal of 51499761264 is 46216799415.

51499761264 is a `hidden beast` number, since 5 + 14 + 9 + 9 + 7 + 612 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51499761264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499761263) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3642304 + ... + 3656415.

Almost surely, 2^51499761264 is an apocalyptic number.

It is an amenable number.

51499761264 is an abundant number, since it is smaller than the sum of its proper divisors (116159135856).

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

51499761264 is a wasteful number, since it uses less digits than its factorization.

51499761264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298747 (or 7298731 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 51499761264 in words is "fifty-one billion, four hundred ninety-nine million, seven hundred sixty-one thousand, two hundred sixty-four".