51813500716668 has 12 divisors (see below), whose sum is σ = 120898168338920. Its totient is φ = 17271166905552.

The previous prime is 51813500716667. The next prime is 51813500716687. The reversal of 51813500716668 is 86661700531815.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51813500716668² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51813500716667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2158895863183 + ... + 2158895863206.

Almost surely, 2^{51813500716668} is an apocalyptic number.

It is an amenable number.

51813500716668 is an abundant number, since it is smaller than the sum of its proper divisors (69084667622252).

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

51813500716668 is a wasteful number, since it uses less digits than its factorization.

51813500716668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317791726396 (or 4317791726394 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 51813500716668 in words is "fifty-one trillion, eight hundred thirteen billion, five hundred million, seven hundred sixteen thousand, six hundred sixty-eight".