669929859 has 14 divisors (see below), whose sum is σ = 1004436396. Its totient is φ = 446619420.

The previous prime is 669929857. The next prime is 669929893. The reversal of 669929859 is 958929966.

It is not a de Polignac number, because 669929859 - 2¹ = 669929857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669929796 and 669929805.

It is not an unprimeable number, because it can be changed into a prime (669929857) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 458757 + ... + 460214.

Almost surely, 2^669929859 is an apocalyptic number.

669929859 is a deficient number, since it is larger than the sum of its proper divisors (334506537).

669929859 is an frugal number, since it uses more digits than its factorization.

669929859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918989 (or 918974 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 669929859 is about 25883.0032840086. The cubic root of 669929859 is about 875.0034760134.

The spelling of 669929859 in words is "six hundred sixty-nine million, nine hundred twenty-nine thousand, eight hundred fifty-nine".