666223507 has 2 divisors, whose sum is σ = 666223508. Its totient is φ = 666223506.

The previous prime is 666223499. The next prime is 666223513. The reversal of 666223507 is 705322666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666223507 - 2³ = 666223499 is a prime.

It is a super-2 number, since 2×666223507² = 887707522558758098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666223567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333111753 + 333111754.

It is an arithmetic number, because the mean of its divisors is an integer number (333111754).

Almost surely, 2^666223507 is an apocalyptic number.

666223507 is a deficient number, since it is larger than the sum of its proper divisors (1).

666223507 is an equidigital number, since it uses as much as digits as its factorization.

666223507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 666223507 is about 25811.3057980413. The cubic root of 666223507 is about 873.3868540159.

The spelling of 666223507 in words is "six hundred sixty-six million, two hundred twenty-three thousand, five hundred seven".