669694499 has 4 divisors (see below), whose sum is σ = 676598664. Its totient is φ = 662790336.

The previous prime is 669694483. The next prime is 669694537. The reversal of 669694499 is 994496966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669694499 - 2⁴ = 669694483 is a prime.

It is a super-2 number, since 2×669694499² = 896981443981722002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669694409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451937 + ... + 3452130.

It is an arithmetic number, because the mean of its divisors is an integer number (169149666).

Almost surely, 2^669694499 is an apocalyptic number.

669694499 is a deficient number, since it is larger than the sum of its proper divisors (6904165).

669694499 is an equidigital number, since it uses as much as digits as its factorization.

669694499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904164.

The product of its digits is 22674816, while the sum is 62.

The square root of 669694499 is about 25878.4562715785. The cubic root of 669694499 is about 874.9009951655.

The spelling of 669694499 in words is "six hundred sixty-nine million, six hundred ninety-four thousand, four hundred ninety-nine".