82787357077861 has 4 divisors (see below), whose sum is σ = 82792613767500. Its totient is φ = 82782100388224.

The previous prime is 82787357077849. The next prime is 82787357077877. The reversal of 82787357077861 is 16877075378728.

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 10978155688900 + 71809201388961 = 3313330^2 + 8474031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82787357077861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82787357077801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2628321196 + ... + 2628352693.

It is an arithmetic number, because the mean of its divisors is an integer number (20698153441875).

Almost surely, 2^{82787357077861} is an apocalyptic number.

It is an amenable number.

82787357077861 is a deficient number, since it is larger than the sum of its proper divisors (5256689639).

82787357077861 is a wasteful number, since it uses less digits than its factorization.

82787357077861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256689638.

The product of its (nonzero) digits is 1548933120, while the sum is 76.

The spelling of 82787357077861 in words is "eighty-two trillion, seven hundred eighty-seven billion, three hundred fifty-seven million, seventy-seven thousand, eight hundred sixty-one".