165515453 has 4 divisors (see below), whose sum is σ = 166159740. Its totient is φ = 164871168.

The previous prime is 165515437. The next prime is 165515459. The reversal of 165515453 is 354515561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354515561 = 41 ⋅8646721.

It can be written as a sum of positive squares in 2 ways, for example, as 160858489 + 4656964 = 12683^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 165515453 - 2⁴ = 165515437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165515459) 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, 321758 + ... + 322271.

It is an arithmetic number, because the mean of its divisors is an integer number (41539935).

Almost surely, 2^165515453 is an apocalyptic number.

It is an amenable number.

165515453 is a deficient number, since it is larger than the sum of its proper divisors (644287).

165515453 is an equidigital number, since it uses as much as digits as its factorization.

165515453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644286.

The product of its digits is 45000, while the sum is 35.

The square root of 165515453 is about 12865.2809141503. The cubic root of 165515453 is about 549.0512049634.

The spelling of 165515453 in words is "one hundred sixty-five million, five hundred fifteen thousand, four hundred fifty-three".