666666610515 has 32 divisors (see below), whose sum is σ = 1236714877440. Its totient is φ = 340096588128.

The previous prime is 666666610487. The next prime is 666666610559. The reversal of 666666610515 is 515016666666.

It is not a de Polignac number, because 666666610515 - 2¹⁴ = 666666594131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107350617 + ... + 107356826.

It is an arithmetic number, because the mean of its divisors is an integer number (38647339920).

Almost surely, 2^666666610515 is an apocalyptic number.

666666610515 is a deficient number, since it is larger than the sum of its proper divisors (570048266925).

666666610515 is a wasteful number, since it uses less digits than its factorization.

666666610515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214707480 (or 214707474 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 666666610515 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred ten thousand, five hundred fifteen".