161405164 has 12 divisors (see below), whose sum is σ = 282792384. Its totient is φ = 80607344.

The previous prime is 161405147. The next prime is 161405183. The reversal of 161405164 is 461504161.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19927 + ... + 26830.

It is an arithmetic number, because the mean of its divisors is an integer number (23566032).

Almost surely, 2^161405164 is an apocalyptic number.

It is an amenable number.

161405164 is a deficient number, since it is larger than the sum of its proper divisors (121387220).

161405164 is a wasteful number, since it uses less digits than its factorization.

161405164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47624 (or 47622 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 161405164 is about 12704.5332066944. The cubic root of 161405164 is about 544.4681442720.

The spelling of 161405164 in words is "one hundred sixty-one million, four hundred five thousand, one hundred sixty-four".