999166161 has 16 divisors (see below), whose sum is σ = 1588737024. Its totient is φ = 546127824.

The previous prime is 999166127. The next prime is 999166237. The reversal of 999166161 is 161661999.

It is not a de Polignac number, because 999166161 - 2¹³ = 999157969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999166161.

It is not an unprimeable number, because it can be changed into a prime (999162161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1033851 + ... + 1034816.

It is an arithmetic number, because the mean of its divisors is an integer number (99296064).

Almost surely, 2^999166161 is an apocalyptic number.

It is an amenable number.

999166161 is a deficient number, since it is larger than the sum of its proper divisors (589570863).

999166161 is a wasteful number, since it uses less digits than its factorization.

999166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068700.

The product of its digits is 157464, while the sum is 48.

The square root of 999166161 is about 31609.5896999629. The cubic root of 999166161 is about 999.7219763767.

The spelling of 999166161 in words is "nine hundred ninety-nine million, one hundred sixty-six thousand, one hundred sixty-one".