666615166 has 16 divisors (see below), whose sum is σ = 1158865920. Its totient is φ = 281667960.

The previous prime is 666615149. The next prime is 666615167. The reversal of 666615166 is 661516666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666615167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334326 + ... + 336313.

It is an arithmetic number, because the mean of its divisors is an integer number (72429120).

Almost surely, 2^666615166 is an apocalyptic number.

666615166 is a deficient number, since it is larger than the sum of its proper divisors (492250754).

666615166 is a wasteful number, since it uses less digits than its factorization.

666615166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670719.

The product of its digits is 233280, while the sum is 43.

The square root of 666615166 is about 25818.8916493331. The cubic root of 666615166 is about 873.5579691689.

The spelling of 666615166 in words is "six hundred sixty-six million, six hundred fifteen thousand, one hundred sixty-six".