51838664656 has 10 divisors (see below), whose sum is σ = 100437412802. Its totient is φ = 25919332320.

The previous prime is 51838664639. The next prime is 51838664677. The reversal of 51838664656 is 65646683815.

51838664656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 31755240000 + 20083424656 = 178200^2 + 141716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51838664656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1619958255 + ... + 1619958286.

Almost surely, 2^51838664656 is an apocalyptic number.

It is an amenable number.

51838664656 is a deficient number, since it is larger than the sum of its proper divisors (48598748146).

51838664656 is a wasteful number, since it uses less digits than its factorization.

51838664656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239916549 (or 3239916543 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 58.

The spelling of 51838664656 in words is "fifty-one billion, eight hundred thirty-eight million, six hundred sixty-four thousand, six hundred fifty-six".