161015165 has 4 divisors (see below), whose sum is σ = 193218204. Its totient is φ = 128812128.

The previous prime is 161015117. The next prime is 161015171. The reversal of 161015165 is 561510161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561510161 = 31 ⋅18113231.

It can be written as a sum of positive squares in 2 ways, for example, as 23609881 + 137405284 = 4859^2 + 11722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161015165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16101512 + ... + 16101521.

It is an arithmetic number, because the mean of its divisors is an integer number (48304551).

Almost surely, 2^161015165 is an apocalyptic number.

It is an amenable number.

161015165 is a deficient number, since it is larger than the sum of its proper divisors (32203039).

161015165 is an equidigital number, since it uses as much as digits as its factorization.

161015165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32203038.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 161015165 is about 12689.1751110937. The cubic root of 161015165 is about 544.0292626362.

The spelling of 161015165 in words is "one hundred sixty-one million, fifteen thousand, one hundred sixty-five".