51656823792 has 160 divisors (see below), whose sum is σ = 169851906560. Its totient is φ = 14724633600.

The previous prime is 51656823737. The next prime is 51656823859. The reversal of 51656823792 is 29732865615.

51656823792 is a `hidden beast` number, since 5 + 1 + 6 + 568 + 2 + 3 + 79 + 2 = 666.

51656823792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1289667 + ... + 1329117.

It is an arithmetic number, because the mean of its divisors is an integer number (1061574416).

Almost surely, 2^51656823792 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 51656823792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84925953280).

51656823792 is an abundant number, since it is smaller than the sum of its proper divisors (118195082768).

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

51656823792 is a wasteful number, since it uses less digits than its factorization.

51656823792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39908 (or 39896 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 51656823792 in words is "fifty-one billion, six hundred fifty-six million, eight hundred twenty-three thousand, seven hundred ninety-two".