165880890233 has 4 divisors (see below), whose sum is σ = 165937760100. Its totient is φ = 165824020368.

The previous prime is 165880890223. The next prime is 165880890281. The reversal of 165880890233 is 332098088561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332098088561 = 103 ⋅3224253287.

It can be written as a sum of positive squares in 2 ways, for example, as 97049694784 + 68831195449 = 311528^2 + 262357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165880890233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165880890223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28430558 + ... + 28436391.

It is an arithmetic number, because the mean of its divisors is an integer number (41484440025).

Almost surely, 2^165880890233 is an apocalyptic number.

It is an amenable number.

165880890233 is a deficient number, since it is larger than the sum of its proper divisors (56869867).

165880890233 is an equidigital number, since it uses as much as digits as its factorization.

165880890233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56869866.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 165880890233 in words is "one hundred sixty-five billion, eight hundred eighty million, eight hundred ninety thousand, two hundred thirty-three".