666225559 has 2 divisors, whose sum is σ = 666225560. Its totient is φ = 666225558.

The previous prime is 666225509. The next prime is 666225583. The reversal of 666225559 is 955522666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666225559 - 2²³ = 657836951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666225509) 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, 333112779 + 333112780.

It is an arithmetic number, because the mean of its divisors is an integer number (333112780).

Almost surely, 2^666225559 is an apocalyptic number.

666225559 is a deficient number, since it is larger than the sum of its proper divisors (1).

666225559 is an equidigital number, since it uses as much as digits as its factorization.

666225559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 46.

The square root of 666225559 is about 25811.3455480337. The cubic root of 666225559 is about 873.3877507060.

The spelling of 666225559 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred fifty-nine".