666877911 has 16 divisors (see below), whose sum is σ = 1019820288. Its totient is φ = 379713600.

The previous prime is 666877873. The next prime is 666877919. The reversal of 666877911 is 119778666.

It is not a de Polignac number, because 666877911 - 2⁹ = 666877399 is a prime.

It is a super-2 number, since 2×666877911² = 889452296359447842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666877919) 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, 50605 + ... + 62406.

It is an arithmetic number, because the mean of its divisors is an integer number (63738768).

Almost surely, 2^666877911 is an apocalyptic number.

666877911 is a deficient number, since it is larger than the sum of its proper divisors (352942377).

666877911 is a wasteful number, since it uses less digits than its factorization.

666877911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113302.

The product of its digits is 762048, while the sum is 51.

The square root of 666877911 is about 25823.9793796386. The cubic root of 666877911 is about 873.6727244538.

The spelling of 666877911 in words is "six hundred sixty-six million, eight hundred seventy-seven thousand, nine hundred eleven".