669674879 has 2 divisors, whose sum is σ = 669674880. Its totient is φ = 669674878.

The previous prime is 669674867. The next prime is 669674899. The reversal of 669674879 is 978476966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669674879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669674899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334837439 + 334837440.

It is an arithmetic number, because the mean of its divisors is an integer number (334837440).

Almost surely, 2^669674879 is an apocalyptic number.

669674879 is a deficient number, since it is larger than the sum of its proper divisors (1).

669674879 is an equidigital number, since it uses as much as digits as its factorization.

669674879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 62.

The square root of 669674879 is about 25878.0771890031. The cubic root of 669674879 is about 874.8924511079.

The spelling of 669674879 in words is "six hundred sixty-nine million, six hundred seventy-four thousand, eight hundred seventy-nine".