669081609 has 12 divisors (see below), whose sum is σ = 1104515776. Its totient is φ = 382332312.

The previous prime is 669081607. The next prime is 669081629. The reversal of 669081609 is 906180966.

It is not a de Polignac number, because 669081609 - 2¹ = 669081607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669081607) 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, 5310109 + ... + 5310234.

Almost surely, 2^669081609 is an apocalyptic number.

It is an amenable number.

669081609 is a deficient number, since it is larger than the sum of its proper divisors (435434167).

669081609 is a wasteful number, since it uses less digits than its factorization.

669081609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620356 (or 10620353 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 669081609 is about 25866.6118577598. The cubic root of 669081609 is about 874.6340168476.

The spelling of 669081609 in words is "six hundred sixty-nine million, eighty-one thousand, six hundred nine".