161564265 has 24 divisors (see below), whose sum is σ = 282192768. Its totient is φ = 85506720.

The previous prime is 161564233. The next prime is 161564279. The reversal of 161564265 is 562465161.

161564265 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 642 + 6 + 5 = 666.

It is not a de Polignac number, because 161564265 - 2⁵ = 161564233 is a prime.

It is a super-2 number, since 2×161564265² = 52206023449980450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7809 + ... + 19598.

It is an arithmetic number, because the mean of its divisors is an integer number (11758032).

Almost surely, 2^161564265 is an apocalyptic number.

161564265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161564265 is a deficient number, since it is larger than the sum of its proper divisors (120628503).

161564265 is a wasteful number, since it uses less digits than its factorization.

161564265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27549 (or 27546 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 161564265 is about 12710.7932482595. The cubic root of 161564265 is about 544.6469840247.

The spelling of 161564265 in words is "one hundred sixty-one million, five hundred sixty-four thousand, two hundred sixty-five".