666560579 has 2 divisors, whose sum is σ = 666560580. Its totient is φ = 666560578.

The previous prime is 666560537. The next prime is 666560581. The reversal of 666560579 is 975065666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666560579 is a prime.

Together with 666560581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666560519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333280289 + 333280290.

It is an arithmetic number, because the mean of its divisors is an integer number (333280290).

Almost surely, 2^666560579 is an apocalyptic number.

666560579 is a deficient number, since it is larger than the sum of its proper divisors (1).

666560579 is an equidigital number, since it uses as much as digits as its factorization.

666560579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The square root of 666560579 is about 25817.8345141493. The cubic root of 666560579 is about 873.5341242216.

The spelling of 666560579 in words is "six hundred sixty-six million, five hundred sixty thousand, five hundred seventy-nine".