81958247222 has 16 divisors (see below), whose sum is σ = 130727658672. Its totient is φ = 38403052800.

The previous prime is 81958247213. The next prime is 81958247227. The reversal of 81958247222 is 22274285918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81958247227) by changing a digit.

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, 5164904 + ... + 5180747.

It is an arithmetic number, because the mean of its divisors is an integer number (8170478667).

Almost surely, 2^81958247222 is an apocalyptic number.

81958247222 is a deficient number, since it is larger than the sum of its proper divisors (48769411450).

81958247222 is a wasteful number, since it uses less digits than its factorization.

81958247222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10345903.

The product of its digits is 1290240, while the sum is 50.

The spelling of 81958247222 in words is "eighty-one billion, nine hundred fifty-eight million, two hundred forty-seven thousand, two hundred twenty-two".