666774888477666 has 32 divisors (see below), whose sum is σ = 1334618271559680. Its totient is φ = 222080249000016.

The previous prime is 666774888477653. The next prime is 666774888477671.

666774888477666 is nontrivially palindromic in base 10.

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, 71291535 + ... + 80100141.

It is an arithmetic number, because the mean of its divisors is an integer number (41706820986240).

Almost surely, 2^{666774888477666} is an apocalyptic number.

666774888477666 is an abundant number, since it is smaller than the sum of its proper divisors (667843383082014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666774888477666 is a wasteful number, since it uses less digits than its factorization.

666774888477666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8818718.

The product of its digits is 917676490752, while the sum is 96.

The spelling of 666774888477666 in words is "six hundred sixty-six trillion, seven hundred seventy-four billion, eight hundred eighty-eight million, four hundred seventy-seven thousand, six hundred sixty-six".