669665566966 has 16 divisors (see below), whose sum is σ = 1096089050448. Its totient is φ = 304317698400.

The previous prime is 669665566943. The next prime is 669665566967.

669665566966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669665566892 and 669665566901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669665566967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696585 + ... + 3873508.

It is an arithmetic number, because the mean of its divisors is an integer number (68505565653).

Almost surely, 2^669665566966 is an apocalyptic number.

669665566966 is a deficient number, since it is larger than the sum of its proper divisors (426423483482).

669665566966 is a wasteful number, since it uses less digits than its factorization.

669665566966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7574127.

The product of its digits is 3401222400, while the sum is 76.

The spelling of 669665566966 in words is "six hundred sixty-nine billion, six hundred sixty-five million, five hundred sixty-six thousand, nine hundred sixty-six".