66866711 has 2 divisors, whose sum is σ = 66866712. Its totient is φ = 66866710.

The previous prime is 66866707. The next prime is 66866713. The reversal of 66866711 is 11766866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66866711 - 2² = 66866707 is a prime.

Together with 66866713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66866713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33433355 + 33433356.

It is an arithmetic number, because the mean of its divisors is an integer number (33433356).

Almost surely, 2^66866711 is an apocalyptic number.

66866711 is a deficient number, since it is larger than the sum of its proper divisors (1).

66866711 is an equidigital number, since it uses as much as digits as its factorization.

66866711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 66866711 is about 8177.2067969448. The cubic root of 66866711 is about 405.8852980677.

The spelling of 66866711 in words is "sixty-six million, eight hundred sixty-six thousand, seven hundred eleven".