161057520 has 120 divisors (see below), whose sum is σ = 582525216. Its totient is φ = 39642624.

The previous prime is 161057497. The next prime is 161057521. The reversal of 161057520 is 25750161.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161057521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 757 + ... + 17963.

Almost surely, 2^161057520 is an apocalyptic number.

161057520 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 161057520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291262608).

161057520 is an abundant number, since it is smaller than the sum of its proper divisors (421467696).

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

161057520 is a wasteful number, since it uses less digits than its factorization.

161057520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17239 (or 17230 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 161057520 is about 12690.8439435681. The cubic root of 161057520 is about 544.0769607092.

The spelling of 161057520 in words is "one hundred sixty-one million, fifty-seven thousand, five hundred twenty".