51651622868136 has 128 divisors (see below), whose sum is σ = 136583999884800. Its totient is φ = 16232014068480.

The previous prime is 51651622868123. The next prime is 51651622868191. The reversal of 51651622868136 is 63186822615615.

It is a super-2 number, since 2×51651622868136² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51651622868136.

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, 1148123035 + ... + 1148168021.

It is an arithmetic number, because the mean of its divisors is an integer number (1067062499100).

Almost surely, 2^{51651622868136} 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 51651622868136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68291999942400).

51651622868136 is an abundant number, since it is smaller than the sum of its proper divisors (84932377016664).

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

51651622868136 is a wasteful number, since it uses less digits than its factorization.

51651622868136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57159 (or 57155 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 60.

The spelling of 51651622868136 in words is "fifty-one trillion, six hundred fifty-one billion, six hundred twenty-two million, eight hundred sixty-eight thousand, one hundred thirty-six".