161223644 has 48 divisors (see below), whose sum is σ = 302702400. Its totient is φ = 74995200.

The previous prime is 161223619. The next prime is 161223661. The reversal of 161223644 is 446322161.

161223644 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 (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518249 + ... + 518559.

It is an arithmetic number, because the mean of its divisors is an integer number (6306300).

Almost surely, 2^161223644 is an apocalyptic number.

It is an amenable number.

161223644 is a deficient number, since it is larger than the sum of its proper divisors (141478756).

161223644 is a wasteful number, since it uses less digits than its factorization.

161223644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 492 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 161223644 is about 12697.3872903050. The cubic root of 161223644 is about 544.2639605317.

The spelling of 161223644 in words is "one hundred sixty-one million, two hundred twenty-three thousand, six hundred forty-four".