51668804718840 has 128 divisors (see below), whose sum is σ = 159929413459200. Its totient is φ = 13345583354880.

The previous prime is 51668804718823. The next prime is 51668804718857. The reversal of 51668804718840 is 4881740886615.

It is an interprime number because it is at equal distance from previous prime (51668804718823) and next prime (51668804718857).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37092342 + ... + 38460101.

It is an arithmetic number, because the mean of its divisors is an integer number (1249448542650).

Almost surely, 2^{51668804718840} is an apocalyptic number.

It is an amenable number.

51668804718840 is an abundant number, since it is smaller than the sum of its proper divisors (108260608740360).

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

51668804718840 is a wasteful number, since it uses less digits than its factorization.

51668804718840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75552637 (or 75552633 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 66.

The spelling of 51668804718840 in words is "fifty-one trillion, six hundred sixty-eight billion, eight hundred four million, seven hundred eighteen thousand, eight hundred forty".