51720616502775 has 72 divisors (see below), whose sum is σ = 103790273222064. Its totient is φ = 24398914867200.

The previous prime is 51720616502761. The next prime is 51720616502813. The reversal of 51720616502775 is 57720561602715.

51720616502775 is a `hidden beast` number, since 5 + 1 + 7 + 2 + 0 + 61 + 6 + 502 + 7 + 75 = 666.

It is not a de Polignac number, because 51720616502775 - 2⁸ = 51720616502519 is a prime.

It is a congruent number.

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, 282303274 + ... + 282486423.

Almost surely, 2^{51720616502775} is an apocalyptic number.

51720616502775 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51720616502775 is an abundant number, since it is smaller than the sum of its proper divisors (52069656719289).

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

51720616502775 is a wasteful number, since it uses less digits than its factorization.

51720616502775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564789761 (or 564789753 counting only the distinct ones).

The product of its (nonzero) digits is 6174000, while the sum is 54.

The spelling of 51720616502775 in words is "fifty-one trillion, seven hundred twenty billion, six hundred sixteen million, five hundred two thousand, seven hundred seventy-five".