666015510507 has 16 divisors (see below), whose sum is σ = 981137940480. Its totient is φ = 399722863232.

The previous prime is 666015510467. The next prime is 666015510509. The reversal of 666015510507 is 705015510666.

It is a cyclic number.

It is not a de Polignac number, because 666015510507 - 2¹² = 666015506411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666015510509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283892907 + ... + 283895252.

It is an arithmetic number, because the mean of its divisors is an integer number (61321121280).

Almost surely, 2^666015510507 is an apocalyptic number.

666015510507 is a deficient number, since it is larger than the sum of its proper divisors (315122429973).

666015510507 is a wasteful number, since it uses less digits than its factorization.

666015510507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567788202.

The product of its (nonzero) digits is 189000, while the sum is 42.

The spelling of 666015510507 in words is "six hundred sixty-six billion, fifteen million, five hundred ten thousand, five hundred seven".