51156077720 has 64 divisors (see below), whose sum is σ = 129894775200. Its totient is φ = 17960750080.

The previous prime is 51156077677. The next prime is 51156077723. The reversal of 51156077720 is 2777065115.

It is a happy number.

51156077720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×51156077720³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51156077723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991789 + ... + 2017308.

Almost surely, 2^51156077720 is an apocalyptic number.

It is an amenable number.

51156077720 is an abundant number, since it is smaller than the sum of its proper divisors (78738697480).

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

51156077720 is a wasteful number, since it uses less digits than its factorization.

51156077720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009148 (or 4009144 counting only the distinct ones).

The product of its (nonzero) digits is 102900, while the sum is 41.

The spelling of 51156077720 in words is "fifty-one billion, one hundred fifty-six million, seventy-seven thousand, seven hundred twenty".