161758152 has 24 divisors (see below), whose sum is σ = 438095190. Its totient is φ = 53919360.

The previous prime is 161758151. The next prime is 161758159. The reversal of 161758152 is 251857161.

161758152 is a `hidden beast` number, since 16 + 17 + 581 + 52 = 666.

It can be written as a sum of positive squares in only one way, i.e., 154107396 + 7650756 = 12414^2 + 2766^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (161758151) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1123249 + ... + 1123392.

Almost surely, 2^161758152 is an apocalyptic number.

161758152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161758152 is an abundant number, since it is smaller than the sum of its proper divisors (276337038).

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

161758152 is a wasteful number, since it uses less digits than its factorization.

161758152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246653 (or 2246646 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 161758152 is about 12718.4178261292. The cubic root of 161758152 is about 544.8647668284.

Subtracting 161758152 from its reverse (251857161), we obtain a palindrome (90099009).

The spelling of 161758152 in words is "one hundred sixty-one million, seven hundred fifty-eight thousand, one hundred fifty-two".