61637056864 has 48 divisors (see below), whose sum is σ = 122119280640. Its totient is φ = 30623002240.

The previous prime is 61637056853. The next prime is 61637056919. The reversal of 61637056864 is 46865073616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6002967 + ... + 6013225.

It is an arithmetic number, because the mean of its divisors is an integer number (2544151680).

Almost surely, 2^61637056864 is an apocalyptic number.

It is an amenable number.

61637056864 is a deficient number, since it is larger than the sum of its proper divisors (60482223776).

61637056864 is a wasteful number, since it uses less digits than its factorization.

61637056864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11443 (or 11435 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 61637056864 in words is "sixty-one billion, six hundred thirty-seven million, fifty-six thousand, eight hundred sixty-four".