61660247637 has 16 divisors (see below), whose sum is σ = 83659464000. Its totient is φ = 40384804224.

The previous prime is 61660247633. The next prime is 61660247653. The reversal of 61660247637 is 73674206616.

It is not a de Polignac number, because 61660247637 - 2² = 61660247633 is a prime.

It is a super-2 number, since 2×61660247637² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660247633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176539 + ... + 393047.

It is an arithmetic number, because the mean of its divisors is an integer number (5228716500).

Almost surely, 2^61660247637 is an apocalyptic number.

It is an amenable number.

61660247637 is a deficient number, since it is larger than the sum of its proper divisors (21999216363).

61660247637 is a wasteful number, since it uses less digits than its factorization.

61660247637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218180.

The product of its (nonzero) digits is 1524096, while the sum is 48.

The spelling of 61660247637 in words is "sixty-one billion, six hundred sixty million, two hundred forty-seven thousand, six hundred thirty-seven".