81207767822 has 16 divisors (see below), whose sum is σ = 127130221440. Its totient is φ = 38831649912.

The previous prime is 81207767819. The next prime is 81207767843. The reversal of 81207767822 is 22876770218.

It is a congruent number.

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, 113093 + ... + 418575.

It is an arithmetic number, because the mean of its divisors is an integer number (7945638840).

Almost surely, 2^81207767822 is an apocalyptic number.

81207767822 is a deficient number, since it is larger than the sum of its proper divisors (45922453618).

81207767822 is a wasteful number, since it uses less digits than its factorization.

81207767822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311287.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 81207767822 in words is "eighty-one billion, two hundred seven million, seven hundred sixty-seven thousand, eight hundred twenty-two".