161375418 has 12 divisors (see below), whose sum is σ = 349646778. Its totient is φ = 53791800.

The previous prime is 161375399. The next prime is 161375447. The reversal of 161375418 is 814573161.

It can be written as a sum of positive squares in only one way, i.e., 161112249 + 263169 = 12693^2 + 513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4482633 + ... + 4482668.

Almost surely, 2^161375418 is an apocalyptic number.

161375418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161375418 is an abundant number, since it is smaller than the sum of its proper divisors (188271360).

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

161375418 is a wasteful number, since it uses less digits than its factorization.

161375418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8965309 (or 8965306 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 161375418 is about 12703.3624682601. The cubic root of 161375418 is about 544.4346948167.

The spelling of 161375418 in words is "one hundred sixty-one million, three hundred seventy-five thousand, four hundred eighteen".