82636631247781 has 8 divisors (see below), whose sum is σ = 94228194907224. Its totient is φ = 71792910405120.

The previous prime is 82636631247761. The next prime is 82636631247853. The reversal of 82636631247781 is 18774213663628.

It can be written as a sum of positive squares in 4 ways, for example, as 257318794756 + 82379312453025 = 507266^2 + 9076305^2 .

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 82636631247781 - 2⁵ = 82636631247749 is a prime.

It is a super-2 number, since 2×82636631247781² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82636631247701) 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, 186960703960 + ... + 186960704401.

It is an arithmetic number, because the mean of its divisors is an integer number (11778524363403).

Almost surely, 2^{82636631247781} is an apocalyptic number.

It is an amenable number.

82636631247781 is a deficient number, since it is larger than the sum of its proper divisors (11591563659443).

82636631247781 is a wasteful number, since it uses less digits than its factorization.

82636631247781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373921408391.

The product of its digits is 97542144, while the sum is 64.

The spelling of 82636631247781 in words is "eighty-two trillion, six hundred thirty-six billion, six hundred thirty-one million, two hundred forty-seven thousand, seven hundred eighty-one".