669389808983966 has 32 divisors (see below), whose sum is σ = 1175566672530432. Its totient is φ = 279871654587840.

The previous prime is 669389808983963. The next prime is 669389808983993.

669389808983966 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×669389808983966³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669389808983963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13440146 + ... + 38979701.

It is an arithmetic number, because the mean of its divisors is an integer number (36736458516576).

Almost surely, 2^{669389808983966} is an apocalyptic number.

669389808983966 is a deficient number, since it is larger than the sum of its proper divisors (506176863546466).

669389808983966 is a wasteful number, since it uses less digits than its factorization.

669389808983966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52442144.

The product of its (nonzero) digits is 313456656384, while the sum is 98.

The spelling of 669389808983966 in words is "six hundred sixty-nine trillion, three hundred eighty-nine billion, eight hundred eight million, nine hundred eighty-three thousand, nine hundred sixty-six".