666645546666 has 32 divisors (see below), whose sum is σ = 1455675380928. Its totient is φ = 201850467840.

The previous prime is 666645546641. The next prime is 666645546719.

666645546666 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 = 666645546597 and 666645546606.

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, 4001095 + ... + 4164378.

It is an arithmetic number, because the mean of its divisors is an integer number (45489855654).

Almost surely, 2^666645546666 is an apocalyptic number.

666645546666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

666645546666 is an abundant number, since it is smaller than the sum of its proper divisors (789029834262).

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

666645546666 is a wasteful number, since it uses less digits than its factorization.

666645546666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8166726.

The product of its digits is 671846400, while the sum is 66.

The spelling of 666645546666 in words is "six hundred sixty-six billion, six hundred forty-five million, five hundred forty-six thousand, six hundred sixty-six".