81973006522 has 16 divisors (see below), whose sum is σ = 134152560000. Its totient is φ = 37256315040.

The previous prime is 81973006517. The next prime is 81973006547. The reversal of 81973006522 is 22560037918.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147 + ... + 404902.

It is an arithmetic number, because the mean of its divisors is an integer number (8384535000).

Almost surely, 2^81973006522 is an apocalyptic number.

81973006522 is a deficient number, since it is larger than the sum of its proper divisors (52179553478).

81973006522 is a wasteful number, since it uses less digits than its factorization.

81973006522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414261.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 81973006522 in words is "eighty-one billion, nine hundred seventy-three million, six thousand, five hundred twenty-two".