161499980 has 12 divisors (see below), whose sum is σ = 339150000. Its totient is φ = 64599984.

The previous prime is 161499979. The next prime is 161499991. The reversal of 161499980 is 89994161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4037480 + ... + 4037519.

It is an arithmetic number, because the mean of its divisors is an integer number (28262500).

Almost surely, 2^161499980 is an apocalyptic number.

161499980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161499980 is an abundant number, since it is smaller than the sum of its proper divisors (177650020).

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

161499980 is a wasteful number, since it uses less digits than its factorization.

161499980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075008 (or 8075006 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 161499980 is about 12708.2642402493. The cubic root of 161499980 is about 544.5747376937.

The spelling of 161499980 in words is "one hundred sixty-one million, four hundred ninety-nine thousand, nine hundred eighty".