161572560 has 80 divisors (see below), whose sum is σ = 503807040. Its totient is φ = 42833920.

The previous prime is 161572549. The next prime is 161572583. The reversal of 161572560 is 65275161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×161572560² = 52211384289907200, which contains 22 as substring.

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, 41080 + ... + 44840.

It is an arithmetic number, because the mean of its divisors is an integer number (6297588).

Almost surely, 2^161572560 is an apocalyptic number.

161572560 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 161572560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251903520).

161572560 is an abundant number, since it is smaller than the sum of its proper divisors (342234480).

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

161572560 is a wasteful number, since it uses less digits than its factorization.

161572560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 161572560 is about 12711.1195415667. The cubic root of 161572560 is about 544.6563049172.

The spelling of 161572560 in words is "one hundred sixty-one million, five hundred seventy-two thousand, five hundred sixty".