166649535233 has 2 divisors, whose sum is σ = 166649535234. Its totient is φ = 166649535232.

The previous prime is 166649535223. The next prime is 166649535257. The reversal of 166649535233 is 332535946661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128860896784 + 37788638449 = 358972^2 + 194393^2 .

It is a cyclic number.

It is not a de Polignac number, because 166649535233 - 2²⁸ = 166381099777 is a prime.

It is not a weakly prime, because it can be changed into another prime (166649535223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83324767616 + 83324767617.

It is an arithmetic number, because the mean of its divisors is an integer number (83324767617).

Almost surely, 2^166649535233 is an apocalyptic number.

It is an amenable number.

166649535233 is a deficient number, since it is larger than the sum of its proper divisors (1).

166649535233 is an equidigital number, since it uses as much as digits as its factorization.

166649535233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10497600, while the sum is 53.

The spelling of 166649535233 in words is "one hundred sixty-six billion, six hundred forty-nine million, five hundred thirty-five thousand, two hundred thirty-three".