666115616658 has 32 divisors (see below), whose sum is σ = 1344243859200. Its totient is φ = 220037086976.

The previous prime is 666115616657. The next prime is 666115616669. The reversal of 666115616658 is 856616511666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666115616598 and 666115616607.

It is not an unprimeable number, because it can be changed into a prime (666115616657) 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, 4172023 + ... + 4328741.

It is an arithmetic number, because the mean of its divisors is an integer number (42007620600).

Almost surely, 2^666115616658 is an apocalyptic number.

666115616658 is an abundant number, since it is smaller than the sum of its proper divisors (678128242542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666115616658 is a wasteful number, since it uses less digits than its factorization.

666115616658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163106.

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

The spelling of 666115616658 in words is "six hundred sixty-six billion, one hundred fifteen million, six hundred sixteen thousand, six hundred fifty-eight".