8168725161 has 27 divisors (see below), whose sum is σ = 12074496343. Its totient is φ = 5321633280.

The previous prime is 8168725129. The next prime is 8168725163. The reversal of 8168725161 is 1615278618.

The square root of 8168725161 is 90381.

It is a perfect power (a square), and thus also a powerful number.

8168725161 is a `hidden beast` number, since 8 + 1 + 68 + 72 + 516 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7373485161 + 795240000 = 85869^2 + 28200^2 .

It is not a de Polignac number, because 8168725161 - 2⁵ = 8168725129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8168725163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12743401 + ... + 12744041.

Almost surely, 2^8168725161 is an apocalyptic number.

8168725161 is the 90381-st square number.

8168725161 is the 45191-st centered octagonal number.

It is an amenable number.

8168725161 is a deficient number, since it is larger than the sum of its proper divisors (3905771182).

8168725161 is an frugal number, since it uses more digits than its factorization.

8168725161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382 (or 691 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The cubic root of 8168725161 is about 2013.9627244019.

The spelling of 8168725161 in words is "eight billion, one hundred sixty-eight million, seven hundred twenty-five thousand, one hundred sixty-one".