666616856115 has 96 divisors (see below), whose sum is σ = 1271860626240. Its totient is φ = 297185366016.

The previous prime is 666616856111. The next prime is 666616856159. The reversal of 666616856115 is 511658616666.

It is not a de Polignac number, because 666616856115 - 2² = 666616856111 is a prime.

It is a super-2 number, since 2×666616856115² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666616856111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4705497 + ... + 4845093.

It is an arithmetic number, because the mean of its divisors is an integer number (13248548190).

Almost surely, 2^666616856115 is an apocalyptic number.

666616856115 is a deficient number, since it is larger than the sum of its proper divisors (605243770125).

666616856115 is a wasteful number, since it uses less digits than its factorization.

666616856115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139781 (or 139774 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 57.

The spelling of 666616856115 in words is "six hundred sixty-six billion, six hundred sixteen million, eight hundred fifty-six thousand, one hundred fifteen".