161565033 has 16 divisors (see below), whose sum is σ = 249313280. Its totient is φ = 91153296.

The previous prime is 161565031. The next prime is 161565049. The reversal of 161565033 is 330565161.

It is not a de Polignac number, because 161565033 - 2¹ = 161565031 is a prime.

It is a super-2 number, since 2×161565033² = 52206519776582178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161565031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47035 + ... + 50352.

It is an arithmetic number, because the mean of its divisors is an integer number (15582080).

Almost surely, 2^161565033 is an apocalyptic number.

It is an amenable number.

161565033 is a deficient number, since it is larger than the sum of its proper divisors (87748247).

161565033 is an equidigital number, since it uses as much as digits as its factorization.

161565033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97476.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 161565033 is about 12710.8234587693. The cubic root of 161565033 is about 544.6478470213.

The spelling of 161565033 in words is "one hundred sixty-one million, five hundred sixty-five thousand, thirty-three".