51656647268 has 12 divisors (see below), whose sum is σ = 90421055340. Its totient is φ = 25822060032.

The previous prime is 51656647249. The next prime is 51656647303. The reversal of 51656647268 is 86274665615.

It can be written as a sum of positive squares in 2 ways, for example, as 44176473124 + 7480174144 = 210182^2 + 86488^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547321 + ... + 1580352.

It is an arithmetic number, because the mean of its divisors is an integer number (7535087945).

Almost surely, 2^51656647268 is an apocalyptic number.

It is an amenable number.

51656647268 is a deficient number, since it is larger than the sum of its proper divisors (38764408072).

51656647268 is a wasteful number, since it uses less digits than its factorization.

51656647268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131806 (or 3131804 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 51656647268 in words is "fifty-one billion, six hundred fifty-six million, six hundred forty-seven thousand, two hundred sixty-eight".