51764238918 has 160 divisors (see below), whose sum is σ = 134435220480. Its totient is φ = 14581607040.

The previous prime is 51764238809. The next prime is 51764238923. The reversal of 51764238918 is 81983246715.

51764238918 is a `hidden beast` number, since 517 + 6 + 4 + 2 + 38 + 91 + 8 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 56820883 + ... + 56821793.

It is an arithmetic number, because the mean of its divisors is an integer number (840220128).

Almost surely, 2^51764238918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51764238918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67217610240).

51764238918 is an abundant number, since it is smaller than the sum of its proper divisors (82670981562).

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

51764238918 is a wasteful number, since it uses less digits than its factorization.

51764238918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584 (or 1575 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 51764238918 in words is "fifty-one billion, seven hundred sixty-four million, two hundred thirty-eight thousand, nine hundred eighteen".