182171897857 has 16 divisors (see below), whose sum is σ = 186105628368. Its totient is φ = 178288588800.

The previous prime is 182171897833. The next prime is 182171897879. The reversal of 182171897857 is 758798171281.

It is a Cunningham number, because it is equal to 426816²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 182171897856 = 1^2 + 426816^2 .

It is a cyclic number.

It is not a de Polignac number, because 182171897857 - 2¹⁵ = 182171865089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (182171897357) 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 15 ways as a sum of consecutive naturals, for example, 4235653 + ... + 4278445.

It is an arithmetic number, because the mean of its divisors is an integer number (11631601773).

Almost surely, 2^182171897857 is an apocalyptic number.

It is an amenable number.

182171897857 is a deficient number, since it is larger than the sum of its proper divisors (3933730511).

182171897857 is a wasteful number, since it uses less digits than its factorization.

182171897857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43380.

The product of its digits is 15805440, while the sum is 64.

The spelling of 182171897857 in words is "one hundred eighty-two billion, one hundred seventy-one million, eight hundred ninety-seven thousand, eight hundred fifty-seven".