669433957 has 4 divisors (see below), whose sum is σ = 676335436. Its totient is φ = 662532480.

The previous prime is 669433907. The next prime is 669433969. The reversal of 669433957 is 759334966.

669433957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 309724801 + 359709156 = 17599^2 + 18966^2 .

It is a cyclic number.

It is not a de Polignac number, because 669433957 - 2²⁷ = 535216229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669433907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3450594 + ... + 3450787.

It is an arithmetic number, because the mean of its divisors is an integer number (169083859).

Almost surely, 2^669433957 is an apocalyptic number.

It is an amenable number.

669433957 is a deficient number, since it is larger than the sum of its proper divisors (6901479).

669433957 is an equidigital number, since it uses as much as digits as its factorization.

669433957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901478.

The product of its digits is 3674160, while the sum is 52.

The square root of 669433957 is about 25873.4218262680. The cubic root of 669433957 is about 874.7875215231.

The spelling of 669433957 in words is "six hundred sixty-nine million, four hundred thirty-three thousand, nine hundred fifty-seven".