165480021 has 24 divisors (see below), whose sum is σ = 280560384. Its totient is φ = 92003040.

The previous prime is 165480013. The next prime is 165480037. The reversal of 165480021 is 120084561.

165480021 is a `hidden beast` number, since 1 + 654 + 8 + 0 + 0 + 2 + 1 = 666.

165480021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165480021 - 2³ = 165480013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165480011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33165 + ... + 37826.

It is an arithmetic number, because the mean of its divisors is an integer number (11690016).

Almost surely, 2^165480021 is an apocalyptic number.

It is an amenable number.

165480021 is a deficient number, since it is larger than the sum of its proper divisors (115080363).

165480021 is a wasteful number, since it uses less digits than its factorization.

165480021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71041 (or 71038 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 165480021 is about 12863.9038009463. The cubic root of 165480021 is about 549.0120235853.

The spelling of 165480021 in words is "one hundred sixty-five million, four hundred eighty thousand, twenty-one".