66606611 has 2 divisors, whose sum is σ = 66606612. Its totient is φ = 66606610.

The previous prime is 66606601. The next prime is 66606667. The reversal of 66606611 is 11660666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66606611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66606601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33303305 + 33303306.

It is an arithmetic number, because the mean of its divisors is an integer number (33303306).

Almost surely, 2^66606611 is an apocalyptic number.

66606611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66606611 is an equidigital number, since it uses as much as digits as its factorization.

66606611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 66606611 is about 8161.2873371791. The cubic root of 66606611 is about 405.3583395604.

The spelling of 66606611 in words is "sixty-six million, six hundred six thousand, six hundred eleven".