81106953727 has 2 divisors, whose sum is σ = 81106953728. Its totient is φ = 81106953726.

The previous prime is 81106953713. The next prime is 81106953751. The reversal of 81106953727 is 72735960118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81106953727 - 2²⁷ = 80972735999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81106953127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553476863 + 40553476864.

It is an arithmetic number, because the mean of its divisors is an integer number (40553476864).

Almost surely, 2^81106953727 is an apocalyptic number.

81106953727 is a deficient number, since it is larger than the sum of its proper divisors (1).

81106953727 is an equidigital number, since it uses as much as digits as its factorization.

81106953727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 81106953727 in words is "eighty-one billion, one hundred six million, nine hundred fifty-three thousand, seven hundred twenty-seven".