161618560 has 64 divisors (see below), whose sum is σ = 406735200. Its totient is φ = 61240320.

The previous prime is 161618557. The next prime is 161618573. The reversal of 161618560 is 65816161.

161618560 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×161618560² = 52241117872947200, which contains 22 as substring.

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, 5515 + ... + 18805.

Almost surely, 2^161618560 is an apocalyptic number.

161618560 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 161618560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203367600).

161618560 is an abundant number, since it is smaller than the sum of its proper divisors (245116640).

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

161618560 is a wasteful number, since it uses less digits than its factorization.

161618560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13329 (or 13317 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 161618560 is about 12712.9288521568. The cubic root of 161618560 is about 544.7079882244.

The spelling of 161618560 in words is "one hundred sixty-one million, six hundred eighteen thousand, five hundred sixty".