161723636 has 12 divisors (see below), whose sum is σ = 284598720. Its totient is φ = 80409720.

The previous prime is 161723623. The next prime is 161723641. The reversal of 161723636 is 636327161.

It is a junction number, because it is equal to n+sod(n) for n = 161723596 and 161723605.

It is a congruent number.

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, 112220 + ... + 113651.

It is an arithmetic number, because the mean of its divisors is an integer number (23716560).

Almost surely, 2^161723636 is an apocalyptic number.

It is an amenable number.

161723636 is a deficient number, since it is larger than the sum of its proper divisors (122875084).

161723636 is a wasteful number, since it uses less digits than its factorization.

161723636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226054 (or 226052 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 161723636 is about 12717.0608239483. The cubic root of 161723636 is about 544.8260096058.

The spelling of 161723636 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, six hundred thirty-six".