161163918 has 24 divisors (see below), whose sum is σ = 362122488. Its totient is φ = 53721144.

The previous prime is 161163917. The next prime is 161163941. The reversal of 161163918 is 819361161.

It is a happy number.

161163918 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 639 + 18 = 666.

161163918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161163918² = 51947616930221448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161163911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165321 + ... + 166292.

It is an arithmetic number, because the mean of its divisors is an integer number (15088437).

Almost surely, 2^161163918 is an apocalyptic number.

161163918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161163918 is an abundant number, since it is smaller than the sum of its proper divisors (200958570).

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

161163918 is an equidigital number, since it uses as much as digits as its factorization.

161163918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331630 (or 331618 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 161163918 is about 12695.0351712786. The cubic root of 161163918 is about 544.1967439138.

The spelling of 161163918 in words is "one hundred sixty-one million, one hundred sixty-three thousand, nine hundred eighteen".