161423604 has 60 divisors (see below), whose sum is σ = 425424384. Its totient is φ = 53370576.

The previous prime is 161423579. The next prime is 161423611. The reversal of 161423604 is 406324161.

161423604 is a `hidden beast` number, since 16 + 1 + 42 + 3 + 604 = 666.

161423604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39187 + ... + 43109.

Almost surely, 2^161423604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161423604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212712192).

161423604 is an abundant number, since it is smaller than the sum of its proper divisors (264000780).

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

161423604 is a wasteful number, since it uses less digits than its factorization.

161423604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066 (or 4055 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 161423604 is about 12705.2589111753. The cubic root of 161423604 is about 544.4888780371.

Adding to 161423604 its reverse (406324161), we get a palindrome (567747765).

The spelling of 161423604 in words is "one hundred sixty-one million, four hundred twenty-three thousand, six hundred four".