161223164 has 12 divisors (see below), whose sum is σ = 286923000. Its totient is φ = 79245168.

The previous prime is 161223163. The next prime is 161223187. The reversal of 161223164 is 461322161.

161223164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161223164² = 51985817220341792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161223163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341339 + ... + 341810.

It is an arithmetic number, because the mean of its divisors is an integer number (23910250).

Almost surely, 2^161223164 is an apocalyptic number.

It is an amenable number.

161223164 is a deficient number, since it is larger than the sum of its proper divisors (125699836).

161223164 is a wasteful number, since it uses less digits than its factorization.

161223164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683212 (or 683210 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 161223164 is about 12697.3683887647. The cubic root of 161223164 is about 544.2634203980.

The spelling of 161223164 in words is "one hundred sixty-one million, two hundred twenty-three thousand, one hundred sixty-four".