161538818 has 32 divisors (see below), whose sum is σ = 286032384. Its totient is φ = 66975552.

The previous prime is 161538791. The next prime is 161538829. The reversal of 161538818 is 818835161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101255 + ... + 102837.

It is an arithmetic number, because the mean of its divisors is an integer number (8938512).

Almost surely, 2^161538818 is an apocalyptic number.

161538818 is a deficient number, since it is larger than the sum of its proper divisors (124493566).

161538818 is a wasteful number, since it uses less digits than its factorization.

161538818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its digits is 46080, while the sum is 41.

The square root of 161538818 is about 12709.7922091590. The cubic root of 161538818 is about 544.6183878507.

The spelling of 161538818 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, eight hundred eighteen".