161165889 has 8 divisors (see below), whose sum is σ = 238764320. Its totient is φ = 107443908.

The previous prime is 161165863. The next prime is 161165929. The reversal of 161165889 is 988561161.

161165889 is a `hidden beast` number, since 1 + 61 + 1 + 6 + 588 + 9 = 666.

It is not a de Polignac number, because 161165889 - 2⁵ = 161165857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161165819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2984527 + ... + 2984580.

It is an arithmetic number, because the mean of its divisors is an integer number (29845540).

Almost surely, 2^161165889 is an apocalyptic number.

It is an amenable number.

161165889 is a deficient number, since it is larger than the sum of its proper divisors (77598431).

161165889 is an equidigital number, since it uses as much as digits as its factorization.

161165889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969116 (or 5969110 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 161165889 is about 12695.1127998140. The cubic root of 161165889 is about 544.1989623744.

The spelling of 161165889 in words is "one hundred sixty-one million, one hundred sixty-five thousand, eight hundred eighty-nine".