81464595675811 has 2 divisors, whose sum is σ = 81464595675812. Its totient is φ = 81464595675810.

The previous prime is 81464595675769. The next prime is 81464595675829. The reversal of 81464595675811 is 11857659546418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81464595675811 - 2¹¹ = 81464595673763 is a prime.

It is not a weakly prime, because it can be changed into another prime (81464595675311) 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, 40732297837905 + 40732297837906.

It is an arithmetic number, because the mean of its divisors is an integer number (40732297837906).

Almost surely, 2^{81464595675811} is an apocalyptic number.

81464595675811 is a deficient number, since it is larger than the sum of its proper divisors (1).

81464595675811 is an equidigital number, since it uses as much as digits as its factorization.

81464595675811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304000, while the sum is 70.

The spelling of 81464595675811 in words is "eighty-one trillion, four hundred sixty-four billion, five hundred ninety-five million, six hundred seventy-five thousand, eight hundred eleven".