82742778193 has 4 divisors (see below), whose sum is σ = 83672472420. Its totient is φ = 81813083968.

The previous prime is 82742778149. The next prime is 82742778203. The reversal of 82742778193 is 39187724728.

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 44439591249 + 38303186944 = 210807^2 + 195712^2 .

It is a cyclic number.

It is not a de Polignac number, because 82742778193 - 2²¹ = 82740681041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82742778143) 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, 464846980 + ... + 464847157.

It is an arithmetic number, because the mean of its divisors is an integer number (20918118105).

Almost surely, 2^82742778193 is an apocalyptic number.

It is an amenable number.

82742778193 is a deficient number, since it is larger than the sum of its proper divisors (929694227).

82742778193 is an equidigital number, since it uses as much as digits as its factorization.

82742778193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929694226.

The product of its digits is 9483264, while the sum is 58.

The spelling of 82742778193 in words is "eighty-two billion, seven hundred forty-two million, seven hundred seventy-eight thousand, one hundred ninety-three".