161765065 has 32 divisors (see below), whose sum is σ = 244788480. Its totient is φ = 99686400.

The previous prime is 161765059. The next prime is 161765111. The reversal of 161765065 is 560567161.

It is not a de Polignac number, because 161765065 - 2²⁵ = 128210633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31905 + ... + 36625.

It is an arithmetic number, because the mean of its divisors is an integer number (7649640).

Almost surely, 2^161765065 is an apocalyptic number.

It is an amenable number.

161765065 is a deficient number, since it is larger than the sum of its proper divisors (83023415).

161765065 is a wasteful number, since it uses less digits than its factorization.

161765065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 161765065 is about 12718.6895944512. The cubic root of 161765065 is about 544.8725286143.

The spelling of 161765065 in words is "one hundred sixty-one million, seven hundred sixty-five thousand, sixty-five".