812741566691 has 2 divisors, whose sum is σ = 812741566692. Its totient is φ = 812741566690.

The previous prime is 812741566661. The next prime is 812741566697. The reversal of 812741566691 is 196665147218.

812741566691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812741566691 - 2¹⁰ = 812741565667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (812741566697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406370783345 + 406370783346.

It is an arithmetic number, because the mean of its divisors is an integer number (406370783346).

Almost surely, 2^812741566691 is an apocalyptic number.

812741566691 is a deficient number, since it is larger than the sum of its proper divisors (1).

812741566691 is an equidigital number, since it uses as much as digits as its factorization.

812741566691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The spelling of 812741566691 in words is "eight hundred twelve billion, seven hundred forty-one million, five hundred sixty-six thousand, six hundred ninety-one".