51999459732 has 48 divisors (see below), whose sum is σ = 147069182400. Its totient is φ = 15757411680.

The previous prime is 51999459719. The next prime is 51999459763. The reversal of 51999459732 is 23795499915.

51999459732 is a `hidden beast` number, since 5 + 1 + 9 + 9 + 9 + 4 + 597 + 32 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51999459732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21884107 + ... + 21886482.

It is an arithmetic number, because the mean of its divisors is an integer number (3063941300).

Almost surely, 2^51999459732 is an apocalyptic number.

It is an amenable number.

51999459732 is an abundant number, since it is smaller than the sum of its proper divisors (95069722668).

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

51999459732 is a wasteful number, since it uses less digits than its factorization.

51999459732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43770613 (or 43770605 counting only the distinct ones).

The product of its digits is 27556200, while the sum is 63.

The spelling of 51999459732 in words is "fifty-one billion, nine hundred ninety-nine million, four hundred fifty-nine thousand, seven hundred thirty-two".