161723952 has 200 divisors, whose sum is σ = 523039440. Its totient is φ = 47900160.

The previous prime is 161723921. The next prime is 161723977. The reversal of 161723952 is 259327161.

161723952 is a `hidden beast` number, since 1 + 617 + 2 + 39 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (22680) is a multiple of the sum of its prime divisors (378).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 488427 + ... + 488757.

Almost surely, 2^161723952 is an apocalyptic number.

161723952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161723952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261519720).

161723952 is an abundant number, since it is smaller than the sum of its proper divisors (361315488).

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

161723952 is a wasteful number, since it uses less digits than its factorization.

161723952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 378 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 161723952 is about 12717.0732481967. The cubic root of 161723952 is about 544.8263644599.

The spelling of 161723952 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, nine hundred fifty-two".