165538776233 has 2 divisors, whose sum is σ = 165538776234. Its totient is φ = 165538776232.

The previous prime is 165538776217. The next prime is 165538776353. The reversal of 165538776233 is 332677835561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165529363609 + 9412624 = 406853^2 + 3068^2 .

It is a cyclic number.

It is not a de Polignac number, because 165538776233 - 2⁴ = 165538776217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165538778233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82769388116 + 82769388117.

It is an arithmetic number, because the mean of its divisors is an integer number (82769388117).

Almost surely, 2^165538776233 is an apocalyptic number.

It is an amenable number.

165538776233 is a deficient number, since it is larger than the sum of its proper divisors (1).

165538776233 is an equidigital number, since it uses as much as digits as its factorization.

165538776233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19051200, while the sum is 56.

The spelling of 165538776233 in words is "one hundred sixty-five billion, five hundred thirty-eight million, seven hundred seventy-six thousand, two hundred thirty-three".