82812755310781 has 8 divisors (see below), whose sum is σ = 87684848370360. Its totient is φ = 77940746085888.

The previous prime is 82812755310749. The next prime is 82812755310823. The reversal of 82812755310781 is 18701355721828.

It can be written as a sum of positive squares in 4 ways, for example, as 41710026388900 + 41102728921881 = 6458330^2 + 6411141^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82812755310781 - 2⁵ = 82812755310749 is a prime.

It is a super-2 number, since 2×82812755310781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82812755310281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18919266 + ... + 22881523.

It is an arithmetic number, because the mean of its divisors is an integer number (10960606046295).

Almost surely, 2^{82812755310781} is an apocalyptic number.

It is an amenable number.

82812755310781 is a deficient number, since it is larger than the sum of its proper divisors (4872093059579).

82812755310781 is a wasteful number, since it uses less digits than its factorization.

82812755310781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41917343.

The product of its (nonzero) digits is 7526400, while the sum is 58.

The spelling of 82812755310781 in words is "eighty-two trillion, eight hundred twelve billion, seven hundred fifty-five million, three hundred ten thousand, seven hundred eighty-one".