81682122631 has 4 divisors (see below), whose sum is σ = 86486953392. Its totient is φ = 76877291872.

The previous prime is 81682122623. The next prime is 81682122637. The reversal of 81682122631 is 13622128618.

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

It is a cyclic number.

It is not a de Polignac number, because 81682122631 - 2³ = 81682122623 is a prime.

It is a super-2 number, since 2×81682122631² (a number of 23 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 (81682122637) 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, 2402415355 + ... + 2402415388.

It is an arithmetic number, because the mean of its divisors is an integer number (21621738348).

Almost surely, 2^81682122631 is an apocalyptic number.

81682122631 is a deficient number, since it is larger than the sum of its proper divisors (4804830761).

81682122631 is a wasteful number, since it uses less digits than its factorization.

81682122631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804830760.

The product of its digits is 55296, while the sum is 40.

The spelling of 81682122631 in words is "eighty-one billion, six hundred eighty-two million, one hundred twenty-two thousand, six hundred thirty-one".