165421524 has 48 divisors (see below), whose sum is σ = 417300800. Its totient is φ = 50823936.

The previous prime is 165421519. The next prime is 165421547. The reversal of 165421524 is 425124561.

It is a junction number, because it is equal to n+sod(n) for n = 165421491 and 165421500.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1369 + ... + 18240.

Almost surely, 2^165421524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165421524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208650400).

165421524 is an abundant number, since it is smaller than the sum of its proper divisors (251879276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165421524 is a wasteful number, since it uses less digits than its factorization.

165421524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19672 (or 19670 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 165421524 is about 12861.6299122623. The cubic root of 165421524 is about 548.9473242515.

The spelling of 165421524 in words is "one hundred sixty-five million, four hundred twenty-one thousand, five hundred twenty-four".