669645546966 has 24 divisors (see below), whose sum is σ = 1582798566024. Its totient is φ = 202922892960.

The previous prime is 669645546943. The next prime is 669645546971.

669645546966 is a `hidden beast` number, since 6 + 6 + 9 + 6 + 4 + 554 + 6 + 9 + 66 = 666.

669645546966 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×669645546966³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669645546894 and 669645546903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1691023911 + ... + 1691024306.

It is an arithmetic number, because the mean of its divisors is an integer number (65949940251).

Almost surely, 2^669645546966 is an apocalyptic number.

669645546966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

669645546966 is an abundant number, since it is smaller than the sum of its proper divisors (913153019058).

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

669645546966 is a wasteful number, since it uses less digits than its factorization.

669645546966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382048236 (or 3382048233 counting only the distinct ones).

The product of its digits is 1511654400, while the sum is 72.

The spelling of 669645546966 in words is "six hundred sixty-nine billion, six hundred forty-five million, five hundred forty-six thousand, nine hundred sixty-six".