161328918 has 16 divisors (see below), whose sum is σ = 322882560. Its totient is φ = 53738856.

The previous prime is 161328911. The next prime is 161328919. The reversal of 161328918 is 819823161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161328911) 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, 823 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (20180160).

Almost surely, 2^161328918 is an apocalyptic number.

161328918 is an abundant number, since it is smaller than the sum of its proper divisors (161553642).

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

161328918 is a wasteful number, since it uses less digits than its factorization.

161328918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18731.

The product of its digits is 20736, while the sum is 39.

The square root of 161328918 is about 12701.5321123083. The cubic root of 161328918 is about 544.3823972082.

The spelling of 161328918 in words is "one hundred sixty-one million, three hundred twenty-eight thousand, nine hundred eighteen".