666576479 has 2 divisors, whose sum is σ = 666576480. Its totient is φ = 666576478.

The previous prime is 666576461. The next prime is 666576503. The reversal of 666576479 is 974675666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666576479 - 2²⁰ = 665527903 is a prime.

It is a Sophie Germain 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 (666572479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333288239 + 333288240.

It is an arithmetic number, because the mean of its divisors is an integer number (333288240).

Almost surely, 2^666576479 is an apocalyptic number.

666576479 is a deficient number, since it is larger than the sum of its proper divisors (1).

666576479 is an equidigital number, since it uses as much as digits as its factorization.

666576479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 56.

The square root of 666576479 is about 25818.1424389905. The cubic root of 666576479 is about 873.5410698679.

The spelling of 666576479 in words is "six hundred sixty-six million, five hundred seventy-six thousand, four hundred seventy-nine".