666016511 has 2 divisors, whose sum is σ = 666016512. Its totient is φ = 666016510.

The previous prime is 666016457. The next prime is 666016537. The reversal of 666016511 is 115610666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666016511 is a prime.

It is a super-2 number, since 2×666016511² = 887155985849226242, 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 (666016711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333008255 + 333008256.

It is an arithmetic number, because the mean of its divisors is an integer number (333008256).

Almost surely, 2^666016511 is an apocalyptic number.

666016511 is a deficient number, since it is larger than the sum of its proper divisors (1).

666016511 is an equidigital number, since it uses as much as digits as its factorization.

666016511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 666016511 is about 25807.2956932725. The cubic root of 666016511 is about 873.2963907254.

The spelling of 666016511 in words is "six hundred sixty-six million, sixteen thousand, five hundred eleven".