51765765120 has 792 divisors, whose sum is σ = 197255208384. Its totient is φ = 13006946304.

The previous prime is 51765765109. The next prime is 51765765133. The reversal of 51765765120 is 2156756715.

51765765120 is a `hidden beast` number, since 5 + 1 + 7 + 6 + 576 + 51 + 20 = 666.

It is a super-2 number, since 2×51765765120² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 772623327 + ... + 772623393.

Almost surely, 2^51765765120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51765765120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98627604192).

51765765120 is an abundant number, since it is smaller than the sum of its proper divisors (145489443264).

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

51765765120 is an frugal number, since it uses more digits than its factorization.

51765765120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 51765765120 in words is "fifty-one billion, seven hundred sixty-five million, seven hundred sixty-five thousand, one hundred twenty".