163998180 has 36 divisors (see below), whose sum is σ = 497461692. Its totient is φ = 43732800.

The previous prime is 163998169. The next prime is 163998203. The reversal of 163998180 is 81899361.

163998180 is a `hidden beast` number, since 1 + 639 + 9 + 8 + 1 + 8 + 0 = 666.

163998180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 143856036 = 4488^2 + 11994^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 455371 + ... + 455730.

Almost surely, 2^163998180 is an apocalyptic number.

163998180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163998180 is an abundant number, since it is smaller than the sum of its proper divisors (333463512).

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

163998180 is a wasteful number, since it uses less digits than its factorization.

163998180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911116 (or 911111 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 163998180 is about 12806.1774156069. The cubic root of 163998180 is about 547.3683426470.

The spelling of 163998180 in words is "one hundred sixty-three million, nine hundred ninety-eight thousand, one hundred eighty".