81168442211 has 2 divisors, whose sum is σ = 81168442212. Its totient is φ = 81168442210.

The previous prime is 81168442177. The next prime is 81168442259. The reversal of 81168442211 is 11224486118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81168442211 - 2²⁶ = 81101333347 is a prime.

It is not a weakly prime, because it can be changed into another prime (81168442711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40584221105 + 40584221106.

It is an arithmetic number, because the mean of its divisors is an integer number (40584221106).

Almost surely, 2^81168442211 is an apocalyptic number.

81168442211 is a deficient number, since it is larger than the sum of its proper divisors (1).

81168442211 is an equidigital number, since it uses as much as digits as its factorization.

81168442211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 38.

The spelling of 81168442211 in words is "eighty-one billion, one hundred sixty-eight million, four hundred forty-two thousand, two hundred eleven".