669644818 has 16 divisors (see below), whose sum is σ = 1016174016. Its totient is φ = 330932880.

The previous prime is 669644809. The next prime is 669644821. The reversal of 669644818 is 818446966.

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, 114780 + ... + 120472.

It is an arithmetic number, because the mean of its divisors is an integer number (63510876).

Almost surely, 2^669644818 is an apocalyptic number.

669644818 is a deficient number, since it is larger than the sum of its proper divisors (346529198).

669644818 is a wasteful number, since it uses less digits than its factorization.

669644818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369.

The product of its digits is 1990656, while the sum is 52.

The square root of 669644818 is about 25877.4963626700. The cubic root of 669644818 is about 874.8793599118.

The spelling of 669644818 in words is "six hundred sixty-nine million, six hundred forty-four thousand, eight hundred eighteen".