82188816257 has 4 divisors (see below), whose sum is σ = 82213717716. Its totient is φ = 82163914800.

The previous prime is 82188816221. The next prime is 82188816263. The reversal of 82188816257 is 75261888128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16750571776 + 65438244481 = 129424^2 + 255809^2 .

It is a cyclic number.

It is not a de Polignac number, because 82188816257 - 2¹⁴ = 82188799873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82188815257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12445778 + ... + 12452379.

It is an arithmetic number, because the mean of its divisors is an integer number (20553429429).

Almost surely, 2^82188816257 is an apocalyptic number.

It is an amenable number.

82188816257 is a deficient number, since it is larger than the sum of its proper divisors (24901459).

82188816257 is a wasteful number, since it uses less digits than its factorization.

82188816257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24901458.

The product of its digits is 3440640, while the sum is 56.

The spelling of 82188816257 in words is "eighty-two billion, one hundred eighty-eight million, eight hundred sixteen thousand, two hundred fifty-seven".