51801687764 has 6 divisors (see below), whose sum is σ = 90652953594. Its totient is φ = 25900843880.

The previous prime is 51801687757. The next prime is 51801687787. The reversal of 51801687764 is 46778610815.

51801687764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50440668100 + 1361019664 = 224590^2 + 36892^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6475210967 + ... + 6475210974.

It is an arithmetic number, because the mean of its divisors is an integer number (15108825599).

Almost surely, 2^51801687764 is an apocalyptic number.

It is an amenable number.

51801687764 is a deficient number, since it is larger than the sum of its proper divisors (38851265830).

51801687764 is a wasteful number, since it uses less digits than its factorization.

51801687764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12950421945 (or 12950421943 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 51801687764 in words is "fifty-one billion, eight hundred one million, six hundred eighty-seven thousand, seven hundred sixty-four".