81222957266 has 8 divisors (see below), whose sum is σ = 132910293744. Its totient is φ = 36919526020.

The previous prime is 81222957259. The next prime is 81222957271. The reversal of 81222957266 is 66275922218.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1845976280 + ... + 1845976323.

It is an arithmetic number, because the mean of its divisors is an integer number (16613786718).

Almost surely, 2^81222957266 is an apocalyptic number.

81222957266 is a deficient number, since it is larger than the sum of its proper divisors (51687336478).

81222957266 is a wasteful number, since it uses less digits than its factorization.

81222957266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691952616.

The product of its digits is 1451520, while the sum is 50.

The spelling of 81222957266 in words is "eighty-one billion, two hundred twenty-two million, nine hundred fifty-seven thousand, two hundred sixty-six".