668166877 has 16 divisors (see below), whose sum is σ = 775681920. Its totient is φ = 563726592.

The previous prime is 668166841. The next prime is 668166893. The reversal of 668166877 is 778661866.

It is a cyclic number.

It is not a de Polignac number, because 668166877 - 2¹⁵ = 668134109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668166817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142858 + ... + 147460.

It is an arithmetic number, because the mean of its divisors is an integer number (48480120).

Almost surely, 2^668166877 is an apocalyptic number.

It is an amenable number.

668166877 is a deficient number, since it is larger than the sum of its proper divisors (107515043).

668166877 is a wasteful number, since it uses less digits than its factorization.

668166877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932.

The product of its digits is 4064256, while the sum is 55.

The square root of 668166877 is about 25848.9240975326. The cubic root of 668166877 is about 874.2352510431.

The spelling of 668166877 in words is "six hundred sixty-eight million, one hundred sixty-six thousand, eight hundred seventy-seven".