666455519 has 2 divisors, whose sum is σ = 666455520. Its totient is φ = 666455518.

The previous prime is 666455509. The next prime is 666455593. The reversal of 666455519 is 915554666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666455519 - 2⁸ = 666455263 is a prime.

It is a super-2 number, since 2×666455519² = 888325917611118722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666455509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333227759 + 333227760.

It is an arithmetic number, because the mean of its divisors is an integer number (333227760).

Almost surely, 2^666455519 is an apocalyptic number.

666455519 is a deficient number, since it is larger than the sum of its proper divisors (1).

666455519 is an equidigital number, since it uses as much as digits as its factorization.

666455519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 47.

The square root of 666455519 is about 25815.7997939246. The cubic root of 666455519 is about 873.4882277594.

The spelling of 666455519 in words is "six hundred sixty-six million, four hundred fifty-five thousand, five hundred nineteen".