51637968544 has 12 divisors (see below), whose sum is σ = 101662250634. Its totient is φ = 25818984256.

The previous prime is 51637968533. The next prime is 51637968553. The reversal of 51637968544 is 44586973615.

It can be written as a sum of positive squares in only one way, i.e., 51070576144 + 567392400 = 225988^2 + 23820^2 .

It is a super-2 number, since 2×51637968544² (a number of 22 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 806843227 + ... + 806843290.

Almost surely, 2^51637968544 is an apocalyptic number.

It is an amenable number.

51637968544 is a deficient number, since it is larger than the sum of its proper divisors (50024282090).

51637968544 is a wasteful number, since it uses less digits than its factorization.

51637968544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613686527 (or 1613686519 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 58.

The spelling of 51637968544 in words is "fifty-one billion, six hundred thirty-seven million, nine hundred sixty-eight thousand, five hundred forty-four".