161520604 has 48 divisors (see below), whose sum is σ = 353868480. Its totient is φ = 62899200.

The previous prime is 161520551. The next prime is 161520613. The reversal of 161520604 is 406025161.

161520604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7954 + ... + 19654.

It is an arithmetic number, because the mean of its divisors is an integer number (7372260).

Almost surely, 2^161520604 is an apocalyptic number.

161520604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161520604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176934240).

161520604 is an abundant number, since it is smaller than the sum of its proper divisors (192347876).

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

161520604 is a wasteful number, since it uses less digits than its factorization.

161520604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11758 (or 11756 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 161520604 is about 12709.0756548224. The cubic root of 161520604 is about 544.5979179470.

Adding to 161520604 its reverse (406025161), we get a palindrome (567545765).

The spelling of 161520604 in words is "one hundred sixty-one million, five hundred twenty thousand, six hundred four".