161535520 has 96 divisors (see below), whose sum is σ = 398768832. Its totient is φ = 61780992.

The previous prime is 161535499. The next prime is 161535523. The reversal of 161535520 is 25535161.

It is not an unprimeable number, because it can be changed into a prime (161535523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364419 + ... + 364861.

It is an arithmetic number, because the mean of its divisors is an integer number (4153842).

Almost surely, 2^161535520 is an apocalyptic number.

161535520 is a gapful number since it is divisible by the number (10) 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 161535520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199384416).

161535520 is an abundant number, since it is smaller than the sum of its proper divisors (237233312).

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

161535520 is a wasteful number, since it uses less digits than its factorization.

161535520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 161535520 is about 12709.6624660138. The cubic root of 161535520 is about 544.6146814894.

The spelling of 161535520 in words is "one hundred sixty-one million, five hundred thirty-five thousand, five hundred twenty".