666474474666 has 64 divisors (see below), whose sum is σ = 1789693710336. Its totient is φ = 159794078400.

The previous prime is 666474474647. The next prime is 666474474691.

666474474666 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 666474474597 and 666474474606.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55478050 + ... + 55490061.

It is an arithmetic number, because the mean of its divisors is an integer number (27963964224).

Almost surely, 2^666474474666 is an apocalyptic number.

666474474666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

666474474666 is an abundant number, since it is smaller than the sum of its proper divisors (1123219235670).

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

666474474666 is a wasteful number, since it uses less digits than its factorization.

666474474666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110968147.

The product of its digits is 585252864, while the sum is 66.

The spelling of 666474474666 in words is "six hundred sixty-six billion, four hundred seventy-four million, four hundred seventy-four thousand, six hundred sixty-six".