81594785711 has 2 divisors, whose sum is σ = 81594785712. Its totient is φ = 81594785710.

The previous prime is 81594785707. The next prime is 81594785803. The reversal of 81594785711 is 11758749518.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81594785711 - 2² = 81594785707 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81594785611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40797392855 + 40797392856.

It is an arithmetic number, because the mean of its divisors is an integer number (40797392856).

Almost surely, 2^81594785711 is an apocalyptic number.

81594785711 is a deficient number, since it is larger than the sum of its proper divisors (1).

81594785711 is an equidigital number, since it uses as much as digits as its factorization.

81594785711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2822400, while the sum is 56.

The spelling of 81594785711 in words is "eighty-one billion, five hundred ninety-four million, seven hundred eighty-five thousand, seven hundred eleven".