161898880 has 256 divisors, whose sum is σ = 478094400. Its totient is φ = 51609600.

The previous prime is 161898857. The next prime is 161898881. The reversal of 161898880 is 88898161.

It is a super-2 number, since 2×161898880² = 52422494690508800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161898881) 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, 2654050 + ... + 2654110.

Almost surely, 2^161898880 is an apocalyptic number.

161898880 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 161898880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239047200).

161898880 is an abundant number, since it is smaller than the sum of its proper divisors (316195520).

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

161898880 is a wasteful number, since it uses less digits than its factorization.

161898880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 49.

The square root of 161898880 is about 12723.9490725168. The cubic root of 161898880 is about 545.0227300230.

The spelling of 161898880 in words is "one hundred sixty-one million, eight hundred ninety-eight thousand, eight hundred eighty".