51360777720 has 96 divisors (see below), whose sum is σ = 190768612320. Its totient is φ = 11739605760.

The previous prime is 51360777719. The next prime is 51360777737. The reversal of 51360777720 is 2777706315.

51360777720 is a `hidden beast` number, since 5 + 13 + 607 + 7 + 7 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10188111 + ... + 10193150.

It is an arithmetic number, because the mean of its divisors is an integer number (1987173045).

Almost surely, 2^51360777720 is an apocalyptic number.

It is an amenable number.

51360777720 is an abundant number, since it is smaller than the sum of its proper divisors (139407834600).

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

51360777720 is a wasteful number, since it uses less digits than its factorization.

51360777720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20381285 (or 20381278 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 45.

The spelling of 51360777720 in words is "fifty-one billion, three hundred sixty million, seven hundred seventy-seven thousand, seven hundred twenty".