66635256654233 has 2 divisors, whose sum is σ = 66635256654234. Its totient is φ = 66635256654232.

The previous prime is 66635256654227. The next prime is 66635256654251. The reversal of 66635256654233 is 33245665253666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66606442270729 + 28814383504 = 8161277^2 + 169748^2 .

It is a cyclic number.

It is not a de Polignac number, because 66635256654233 - 2³² = 66630961686937 is a prime.

It is not a weakly prime, because it can be changed into another prime (66635256654223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33317628327116 + 33317628327117.

It is an arithmetic number, because the mean of its divisors is an integer number (33317628327117).

Almost surely, 2^{66635256654233} is an apocalyptic number.

It is an amenable number.

66635256654233 is a deficient number, since it is larger than the sum of its proper divisors (1).

66635256654233 is an equidigital number, since it uses as much as digits as its factorization.

66635256654233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904000, while the sum is 62.

The spelling of 66635256654233 in words is "sixty-six trillion, six hundred thirty-five billion, two hundred fifty-six million, six hundred fifty-four thousand, two hundred thirty-three".