51751878717 has 24 divisors (see below), whose sum is σ = 86680836928. Its totient is φ = 26884091520.

The previous prime is 51751878707. The next prime is 51751878721. The reversal of 51751878717 is 71787815715.

It is not a de Polignac number, because 51751878717 - 2¹⁰ = 51751877693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51751878707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10180828 + ... + 10185909.

Almost surely, 2^51751878717 is an apocalyptic number.

It is an amenable number.

51751878717 is a deficient number, since it is larger than the sum of its proper divisors (34928958211).

51751878717 is a wasteful number, since it uses less digits than its factorization.

51751878717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20366769 (or 20366758 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 57.

The spelling of 51751878717 in words is "fifty-one billion, seven hundred fifty-one million, eight hundred seventy-eight thousand, seven hundred seventeen".