669990951 has 12 divisors (see below), whose sum is σ = 1106016912. Its totient is φ = 382851936.

The previous prime is 669990947. The next prime is 669990953. The reversal of 669990951 is 159099966.

It is not a de Polignac number, because 669990951 - 2² = 669990947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669990953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5317326 + ... + 5317451.

It is an arithmetic number, because the mean of its divisors is an integer number (92168076).

Almost surely, 2^669990951 is an apocalyptic number.

669990951 is a deficient number, since it is larger than the sum of its proper divisors (436025961).

669990951 is a wasteful number, since it uses less digits than its factorization.

669990951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634790 (or 10634787 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 669990951 is about 25884.1834138147. The cubic root of 669990951 is about 875.0300728712.

The spelling of 669990951 in words is "six hundred sixty-nine million, nine hundred ninety thousand, nine hundred fifty-one".