161565115 has 16 divisors (see below), whose sum is σ = 197683200. Its totient is φ = 126735840.

The previous prime is 161565101. The next prime is 161565137. The reversal of 161565115 is 511565161.

161565115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161565115 - 2¹¹ = 161563067 is a prime.

It is a super-2 number, since 2×161565115² = 52206572769926450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69502 + ... + 71788.

It is an arithmetic number, because the mean of its divisors is an integer number (12355200).

Almost surely, 2^161565115 is an apocalyptic number.

161565115 is a deficient number, since it is larger than the sum of its proper divisors (36118085).

161565115 is a wasteful number, since it uses less digits than its factorization.

161565115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562.

The product of its digits is 4500, while the sum is 31.

The square root of 161565115 is about 12710.8266843664. The cubic root of 161565115 is about 544.6479391640.

The spelling of 161565115 in words is "one hundred sixty-one million, five hundred sixty-five thousand, one hundred fifteen".