51639596788 has 18 divisors (see below), whose sum is σ = 97323866934. Its totient is φ = 23832903744.

The previous prime is 51639596783. The next prime is 51639596807. The reversal of 51639596788 is 88769593615.

It can be written as a sum of positive squares in 3 ways, for example, as 14023770084 + 37615826704 = 118422^2 + 193948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51639596783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1622920 + ... + 1654432.

Almost surely, 2^51639596788 is an apocalyptic number.

It is an amenable number.

51639596788 is a deficient number, since it is larger than the sum of its proper divisors (45684270146).

51639596788 is an frugal number, since it uses more digits than its factorization.

51639596788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63043 (or 31528 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 67.

The spelling of 51639596788 in words is "fifty-one billion, six hundred thirty-nine million, five hundred ninety-six thousand, seven hundred eighty-eight".