161996880 has 40 divisors (see below), whose sum is σ = 502191072. Its totient is φ = 43199104.

The previous prime is 161996873. The next prime is 161996899. The reversal of 161996880 is 88699161.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 337254 + ... + 337733.

Almost surely, 2^161996880 is an apocalyptic number.

161996880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161996880 is an abundant number, since it is smaller than the sum of its proper divisors (340194192).

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

161996880 is a wasteful number, since it uses less digits than its factorization.

161996880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675003 (or 674997 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 161996880 is about 12727.7994955923. The cubic root of 161996880 is about 545.1326781875.

The spelling of 161996880 in words is "one hundred sixty-one million, nine hundred ninety-six thousand, eight hundred eighty".