61656500979 has 6 divisors (see below), whose sum is σ = 89059390316. Its totient is φ = 41104333980.

The previous prime is 61656500909. The next prime is 61656500987. The reversal of 61656500979 is 97900565616.

61656500979 is a `hidden beast` number, since 6 + 1 + 6 + 565 + 0 + 0 + 9 + 79 = 666.

It is not a de Polignac number, because 61656500979 - 2¹⁶ = 61656435443 is a prime.

It is a super-2 number, since 2×61656500979² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61656500909) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3425361157 + ... + 3425361174.

Almost surely, 2^61656500979 is an apocalyptic number.

61656500979 is a deficient number, since it is larger than the sum of its proper divisors (27402889337).

61656500979 is a wasteful number, since it uses less digits than its factorization.

61656500979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850722337 (or 6850722334 counting only the distinct ones).

The product of its (nonzero) digits is 3061800, while the sum is 54.

The spelling of 61656500979 in words is "sixty-one billion, six hundred fifty-six million, five hundred thousand, nine hundred seventy-nine".