161218560 has 152 divisors (see below), whose sum is σ = 528481296. Its totient is φ = 41943040.

The previous prime is 161218489. The next prime is 161218609. The reversal of 161218560 is 65812161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3932140 + ... + 3932180.

Almost surely, 2^161218560 is an apocalyptic number.

161218560 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 161218560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264240648).

161218560 is an abundant number, since it is smaller than the sum of its proper divisors (367262736).

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

161218560 is an frugal number, since it uses more digits than its factorization.

161218560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 161218560 is about 12697.1870900605. The cubic root of 161218560 is about 544.2582395614.

The spelling of 161218560 in words is "one hundred sixty-one million, two hundred eighteen thousand, five hundred sixty".