161165818 has 16 divisors (see below), whose sum is σ = 272820960. Its totient is φ = 70730800.

The previous prime is 161165803. The next prime is 161165819. The reversal of 161165818 is 818561161.

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, 125668 + ... + 126943.

It is an arithmetic number, because the mean of its divisors is an integer number (17051310).

Almost surely, 2^161165818 is an apocalyptic number.

161165818 is a deficient number, since it is larger than the sum of its proper divisors (111655142).

161165818 is a wasteful number, since it uses less digits than its factorization.

161165818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252653.

The product of its digits is 11520, while the sum is 37.

The square root of 161165818 is about 12695.1100034620. The cubic root of 161165818 is about 544.1988824607.

The spelling of 161165818 in words is "one hundred sixty-one million, one hundred sixty-five thousand, eight hundred eighteen".