161204436 has 36 divisors (see below), whose sum is σ = 428937600. Its totient is φ = 50906448.

The previous prime is 161204423. The next prime is 161204443. The reversal of 161204436 is 634402161.

161204436 is a `hidden beast` number, since 1 + 612 + 0 + 4 + 43 + 6 = 666.

161204436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117156 + ... + 118523.

Almost surely, 2^161204436 is an apocalyptic number.

It is an amenable number.

161204436 is an abundant number, since it is smaller than the sum of its proper divisors (267733164).

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

161204436 is a wasteful number, since it uses less digits than its factorization.

161204436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235708 (or 235703 counting only the distinct ones).

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

The square root of 161204436 is about 12696.6308916972. The cubic root of 161204436 is about 544.2423453453.

Adding to 161204436 its reverse (634402161), we get a palindrome (795606597).

The spelling of 161204436 in words is "one hundred sixty-one million, two hundred four thousand, four hundred thirty-six".