81420822082 has 16 divisors (see below), whose sum is σ = 123991212672. Its totient is φ = 40091712640.

The previous prime is 81420822019. The next prime is 81420822101. The reversal of 81420822082 is 28022802418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197263 + ... + 449170.

It is an arithmetic number, because the mean of its divisors is an integer number (7749450792).

Almost surely, 2^81420822082 is an apocalyptic number.

81420822082 is a deficient number, since it is larger than the sum of its proper divisors (42570390590).

81420822082 is a wasteful number, since it uses less digits than its factorization.

81420822082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647393.

The product of its (nonzero) digits is 32768, while the sum is 37.

The spelling of 81420822082 in words is "eighty-one billion, four hundred twenty million, eight hundred twenty-two thousand, eighty-two".