161655233 has 4 divisors (see below), whose sum is σ = 161694720. Its totient is φ = 161615748.

The previous prime is 161655229. The next prime is 161655271. The reversal of 161655233 is 332556161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161655233 - 2² = 161655229 is a prime.

It is a super-2 number, since 2×161655233² = 52264828712568578, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161655233.

It is not an unprimeable number, because it can be changed into a prime (161655223) 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, 12785 + ... + 22062.

It is an arithmetic number, because the mean of its divisors is an integer number (40423680).

Almost surely, 2^161655233 is an apocalyptic number.

It is an amenable number.

161655233 is a deficient number, since it is larger than the sum of its proper divisors (39487).

161655233 is an equidigital number, since it uses as much as digits as its factorization.

161655233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39486.

The product of its digits is 16200, while the sum is 32.

The square root of 161655233 is about 12714.3711209009. The cubic root of 161655233 is about 544.7491851540.

The spelling of 161655233 in words is "one hundred sixty-one million, six hundred fifty-five thousand, two hundred thirty-three".