669389808983967 has 24 divisors (see below), whose sum is σ = 988280050919616. Its totient is φ = 436406094821376.

The previous prime is 669389808983963. The next prime is 669389808983993. The reversal of 669389808983967 is 769389808983966.

669389808983967 is a `hidden beast` number, since 6 + 6 + 9 + 38 + 98 + 0 + 8 + 98 + 396 + 7 = 666.

It is not a de Polignac number, because 669389808983967 - 2² = 669389808983963 is a prime.

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 pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649642078 + ... + 650671659.

It is an arithmetic number, because the mean of its divisors is an integer number (41178335454984).

Almost surely, 2^{669389808983967} is an apocalyptic number.

669389808983967 is a deficient number, since it is larger than the sum of its proper divisors (318890241935649).

669389808983967 is a wasteful number, since it uses less digits than its factorization.

669389808983967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300315007 (or 1300315004 counting only the distinct ones).

The product of its (nonzero) digits is 365699432448, while the sum is 99.

Subtracting 669389808983967 from its reverse (769389808983966), we obtain a palindrome (99999999999999).

The spelling of 669389808983967 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-seven".