669565966 has 16 divisors (see below), whose sum is σ = 1067682960. Its totient is φ = 314020800.

The previous prime is 669565937. The next prime is 669565973.

It is a happy number.

669565966 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 669565966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83391 + ... + 91066.

It is an arithmetic number, because the mean of its divisors is an integer number (66730185).

Almost surely, 2^669565966 is an apocalyptic number.

669565966 is a deficient number, since it is larger than the sum of its proper divisors (398116994).

669565966 is a wasteful number, since it uses less digits than its factorization.

669565966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174579.

The product of its digits is 15746400, while the sum is 58.

The square root of 669565966 is about 25875.9727546618. The cubic root of 669565966 is about 874.8450189730.

The spelling of 669565966 in words is "six hundred sixty-nine million, five hundred sixty-five thousand, nine hundred sixty-six".