161913570 has 128 divisors (see below), whose sum is σ = 483065856. Its totient is φ = 33820416.

The previous prime is 161913553. The next prime is 161913599. The reversal of 161913570 is 75319161.

It is a happy number.

161913570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 346477 + ... + 346943.

It is an arithmetic number, because the mean of its divisors is an integer number (3773952).

Almost surely, 2^161913570 is an apocalyptic number.

161913570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161913570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241532928).

161913570 is an abundant number, since it is smaller than the sum of its proper divisors (321152286).

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

161913570 is a wasteful number, since it uses less digits than its factorization.

161913570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 161913570 is about 12724.5263173133. The cubic root of 161913570 is about 545.0392138549.

The spelling of 161913570 in words is "one hundred sixty-one million, nine hundred thirteen thousand, five hundred seventy".