161996080 has 80 divisors (see below), whose sum is σ = 393974784. Its totient is φ = 61873920.

The previous prime is 161996047. The next prime is 161996089. The reversal of 161996080 is 80699161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (161996089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205447 + ... + 206233.

Almost surely, 2^161996080 is an apocalyptic number.

161996080 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 161996080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196987392).

161996080 is an abundant number, since it is smaller than the sum of its proper divisors (231978704).

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

161996080 is a wasteful number, since it uses less digits than its factorization.

161996080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 161996080 is about 12727.7680682828. The cubic root of 161996080 is about 545.1317808310.

The spelling of 161996080 in words is "one hundred sixty-one million, nine hundred ninety-six thousand, eighty".