66185280211 has 2 divisors, whose sum is σ = 66185280212. Its totient is φ = 66185280210.

The previous prime is 66185280191. The next prime is 66185280307. The reversal of 66185280211 is 11208258166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66185280211 - 2²³ = 66176891603 is a prime.

It is not a weakly prime, because it can be changed into another prime (66185280611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33092640105 + 33092640106.

It is an arithmetic number, because the mean of its divisors is an integer number (33092640106).

Almost surely, 2^66185280211 is an apocalyptic number.

66185280211 is a deficient number, since it is larger than the sum of its proper divisors (1).

66185280211 is an equidigital number, since it uses as much as digits as its factorization.

66185280211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 66185280211 in words is "sixty-six billion, one hundred eighty-five million, two hundred eighty thousand, two hundred eleven".