81672395489227 has 2 divisors, whose sum is σ = 81672395489228. Its totient is φ = 81672395489226.

The previous prime is 81672395489131. The next prime is 81672395489339. The reversal of 81672395489227 is 72298459327618.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81672395489227 - 2⁷ = 81672395489099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81672395489227.

It is not a weakly prime, because it can be changed into another prime (81672395289227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40836197744613 + 40836197744614.

It is an arithmetic number, because the mean of its divisors is an integer number (40836197744614).

Almost surely, 2^{81672395489227} is an apocalyptic number.

81672395489227 is a deficient number, since it is larger than the sum of its proper divisors (1).

81672395489227 is an equidigital number, since it uses as much as digits as its factorization.

81672395489227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 731566080, while the sum is 73.

The spelling of 81672395489227 in words is "eighty-one trillion, six hundred seventy-two billion, three hundred ninety-five million, four hundred eighty-nine thousand, two hundred twenty-seven".