161798722 has 16 divisors (see below), whose sum is σ = 248239872. Its totient is φ = 79057440.

The previous prime is 161798717. The next prime is 161798729. The reversal of 161798722 is 227897161.

It is not an unprimeable number, because it can be changed into a prime (161798729) 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, 121822 + ... + 123142.

It is an arithmetic number, because the mean of its divisors is an integer number (15514992).

Almost surely, 2^161798722 is an apocalyptic number.

161798722 is a deficient number, since it is larger than the sum of its proper divisors (86441150).

161798722 is a wasteful number, since it uses less digits than its factorization.

161798722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673.

The product of its digits is 84672, while the sum is 43.

The square root of 161798722 is about 12720.0126572264. The cubic root of 161798722 is about 544.9103149002.

The spelling of 161798722 in words is "one hundred sixty-one million, seven hundred ninety-eight thousand, seven hundred twenty-two".