51777804880 has 20 divisors (see below), whose sum is σ = 120383396532. Its totient is φ = 20711121920.

The previous prime is 51777804857. The next prime is 51777804943. The reversal of 51777804880 is 8840877715.

It can be written as a sum of positive squares in 2 ways, for example, as 20120855104 + 31656949776 = 141848^2 + 177924^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323611201 + ... + 323611360.

Almost surely, 2^51777804880 is an apocalyptic number.

It is an amenable number.

51777804880 is an abundant number, since it is smaller than the sum of its proper divisors (68605591652).

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

51777804880 is a wasteful number, since it uses less digits than its factorization.

51777804880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647222574 (or 647222568 counting only the distinct ones).

The product of its (nonzero) digits is 3512320, while the sum is 55.

The spelling of 51777804880 in words is "fifty-one billion, seven hundred seventy-seven million, eight hundred four thousand, eight hundred eighty".