161560140 has 96 divisors (see below), whose sum is σ = 519859200. Its totient is φ = 36723456.

The previous prime is 161560123. The next prime is 161560141. The reversal of 161560140 is 41065161.

It is a super-2 number, since 2×161560140² = 52203357673639200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161560140.

It is not an unprimeable number, because it can be changed into a prime (161560141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82614 + ... + 84546.

It is an arithmetic number, because the mean of its divisors is an integer number (5415200).

Almost surely, 2^161560140 is an apocalyptic number.

161560140 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 161560140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259929600).

161560140 is an abundant number, since it is smaller than the sum of its proper divisors (358299060).

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

161560140 is a wasteful number, since it uses less digits than its factorization.

161560140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151 (or 2149 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161560140 is about 12710.6309835507. The cubic root of 161560140 is about 544.6423487424.

The spelling of 161560140 in words is "one hundred sixty-one million, five hundred sixty thousand, one hundred forty".