165225761 has 4 divisors (see below), whose sum is σ = 165300912. Its totient is φ = 165150612.

The previous prime is 165225713. The next prime is 165225773. The reversal of 165225761 is 167522561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167522561 = 12149 ⋅13789.

It is a cyclic number.

It is not a de Polignac number, because 165225761 - 2¹⁰ = 165224737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165225161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34175 + ... + 38708.

It is an arithmetic number, because the mean of its divisors is an integer number (41325228).

Almost surely, 2^165225761 is an apocalyptic number.

It is an amenable number.

165225761 is a deficient number, since it is larger than the sum of its proper divisors (75151).

165225761 is an equidigital number, since it uses as much as digits as its factorization.

165225761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75150.

The product of its digits is 25200, while the sum is 35.

The square root of 165225761 is about 12854.0173097752. The cubic root of 165225761 is about 548.7306938481.

The spelling of 165225761 in words is "one hundred sixty-five million, two hundred twenty-five thousand, seven hundred sixty-one".