669744447966 has 48 divisors (see below), whose sum is σ = 1584327288960. Its totient is φ = 202786842960.

The previous prime is 669744447947. The next prime is 669744448007.

669744447966 is a `hidden beast` number, since 6 + 6 + 97 + 4 + 4 + 4 + 479 + 66 = 666.

669744447966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669744447894 and 669744447903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1140736 + ... + 1625043.

It is an arithmetic number, because the mean of its divisors is an integer number (33006818520).

Almost surely, 2^669744447966 is an apocalyptic number.

669744447966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

669744447966 is an abundant number, since it is smaller than the sum of its proper divisors (914582840994).

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

669744447966 is a wasteful number, since it uses less digits than its factorization.

669744447966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767021 (or 2767018 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 72.

The spelling of 669744447966 in words is "six hundred sixty-nine billion, seven hundred forty-four million, four hundred forty-seven thousand, nine hundred sixty-six".