666111309715 has 16 divisors (see below), whose sum is σ = 841583232000. Its totient is φ = 504734572512.

The previous prime is 666111309709. The next prime is 666111309733. The reversal of 666111309715 is 517903111666.

It is a cyclic number.

It is not a de Polignac number, because 666111309715 - 2⁵ = 666111309683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298665 + ... + 1192234.

It is an arithmetic number, because the mean of its divisors is an integer number (52598952000).

Almost surely, 2^666111309715 is an apocalyptic number.

666111309715 is a deficient number, since it is larger than the sum of its proper divisors (175471922285).

666111309715 is a wasteful number, since it uses less digits than its factorization.

666111309715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495626.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 666111309715 in words is "six hundred sixty-six billion, one hundred eleven million, three hundred nine thousand, seven hundred fifteen".