669636844 has 6 divisors (see below), whose sum is σ = 1171864484. Its totient is φ = 334818420.

The previous prime is 669636787. The next prime is 669636899. The reversal of 669636844 is 448636966.

It is a junction number, because it is equal to n+sod(n) for n = 669636791 and 669636800.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83704602 + ... + 83704609.

Almost surely, 2^669636844 is an apocalyptic number.

It is an amenable number.

669636844 is a deficient number, since it is larger than the sum of its proper divisors (502227640).

669636844 is a wasteful number, since it uses less digits than its factorization.

669636844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167409215 (or 167409213 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 52.

The square root of 669636844 is about 25877.3422901194. The cubic root of 669636844 is about 874.8758872670.

The spelling of 669636844 in words is "six hundred sixty-nine million, six hundred thirty-six thousand, eight hundred forty-four".