655666559 has 2 divisors, whose sum is σ = 655666560. Its totient is φ = 655666558.

The previous prime is 655666511. The next prime is 655666577. The reversal of 655666559 is 955666556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655666559 - 2⁸ = 655666303 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655666559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655666259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327833279 + 327833280.

It is an arithmetic number, because the mean of its divisors is an integer number (327833280).

Almost surely, 2^655666559 is an apocalyptic number.

655666559 is a deficient number, since it is larger than the sum of its proper divisors (1).

655666559 is an equidigital number, since it uses as much as digits as its factorization.

655666559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290000, while the sum is 53.

The square root of 655666559 is about 25605.9867804387. The cubic root of 655666559 is about 868.7490538851.

The spelling of 655666559 in words is "six hundred fifty-five million, six hundred sixty-six thousand, five hundred fifty-nine".