66656911 has 2 divisors, whose sum is σ = 66656912. Its totient is φ = 66656910.

The previous prime is 66656903. The next prime is 66656927. The reversal of 66656911 is 11965666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66656911 - 2³ = 66656903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66656981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33328455 + 33328456.

It is an arithmetic number, because the mean of its divisors is an integer number (33328456).

Almost surely, 2^66656911 is an apocalyptic number.

66656911 is a deficient number, since it is larger than the sum of its proper divisors (1).

66656911 is an equidigital number, since it uses as much as digits as its factorization.

66656911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 66656911 is about 8164.3683772843. The cubic root of 66656911 is about 405.4603534283.

The spelling of 66656911 in words is "sixty-six million, six hundred fifty-six thousand, nine hundred eleven".