161958888 has 192 divisors, whose sum is σ = 568713600. Its totient is φ = 40435200.

The previous prime is 161958877. The next prime is 161958913. The reversal of 161958888 is 888859161.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123838 + ... + 125138.

It is an arithmetic number, because the mean of its divisors is an integer number (2962050).

Almost surely, 2^161958888 is an apocalyptic number.

161958888 is a gapful number since it is divisible by the number (18) 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 161958888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284356800).

161958888 is an abundant number, since it is smaller than the sum of its proper divisors (406754712).

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

161958888 is a wasteful number, since it uses less digits than its factorization.

161958888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352 (or 1345 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 54.

The square root of 161958888 is about 12726.3069269918. The cubic root of 161958888 is about 545.0900594655.

The spelling of 161958888 in words is "one hundred sixty-one million, nine hundred fifty-eight thousand, eight hundred eighty-eight".