161993160 has 96 divisors (see below), whose sum is σ = 601698240. Its totient is φ = 37026432.

The previous prime is 161993137. The next prime is 161993177. The reversal of 161993160 is 61399161.

161993160 is a `hidden beast` number, since 1 + 619 + 9 + 31 + 6 + 0 = 666.

161993160 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29622 + ... + 34661.

It is an arithmetic number, because the mean of its divisors is an integer number (6267690).

Almost surely, 2^161993160 is an apocalyptic number.

161993160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161993160 is an abundant number, since it is smaller than the sum of its proper divisors (439705080).

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

161993160 is a wasteful number, since it uses less digits than its factorization.

161993160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64307 (or 64300 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 161993160 is about 12727.6533579447. The cubic root of 161993160 is about 545.1285054547.

The spelling of 161993160 in words is "one hundred sixty-one million, nine hundred ninety-three thousand, one hundred sixty".