669997585799966 has 64 divisors (see below), whose sum is σ = 1078146107596800. Its totient is φ = 311755005120000.

The previous prime is 669997585799953. The next prime is 669997585799977.

669997585799966 is nontrivially palindromic in base 10.

669997585799966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 29866310 + ... + 47243958.

It is an arithmetic number, because the mean of its divisors is an integer number (16846032931200).

Almost surely, 2^{669997585799966} is an apocalyptic number.

669997585799966 is a deficient number, since it is larger than the sum of its proper divisors (408148521796834).

669997585799966 is a wasteful number, since it uses less digits than its factorization.

669997585799966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17377961.

The product of its digits is 6749725852800, while the sum is 110.

The spelling of 669997585799966 in words is "six hundred sixty-nine trillion, nine hundred ninety-seven billion, five hundred eighty-five million, seven hundred ninety-nine thousand, nine hundred sixty-six".