669906698 has 16 divisors (see below), whose sum is σ = 1027382400. Its totient is φ = 327461856.

The previous prime is 669906661. The next prime is 669906707. The reversal of 669906698 is 896609966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93653 + ... + 100551.

It is an arithmetic number, because the mean of its divisors is an integer number (64211400).

Almost surely, 2^669906698 is an apocalyptic number.

669906698 is a deficient number, since it is larger than the sum of its proper divisors (357475702).

669906698 is a wasteful number, since it uses less digits than its factorization.

669906698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7981.

The product of its (nonzero) digits is 7558272, while the sum is 59.

The square root of 669906698 is about 25882.5558629746. Note that the first 3 decimals coincide. The cubic root of 669906698 is about 874.9933922766.

The spelling of 669906698 in words is "six hundred sixty-nine million, nine hundred six thousand, six hundred ninety-eight".