806881909693 has 2 divisors, whose sum is σ = 806881909694. Its totient is φ = 806881909692.

The previous prime is 806881909667. The next prime is 806881909759. The reversal of 806881909693 is 396909188608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794875667364 + 12006242329 = 891558^2 + 109573^2 .

It is a cyclic number.

It is not a de Polignac number, because 806881909693 - 2⁹ = 806881909181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806881909663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403440954846 + 403440954847.

It is an arithmetic number, because the mean of its divisors is an integer number (403440954847).

Almost surely, 2^806881909693 is an apocalyptic number.

It is an amenable number.

806881909693 is a deficient number, since it is larger than the sum of its proper divisors (1).

806881909693 is an equidigital number, since it uses as much as digits as its factorization.

806881909693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40310784, while the sum is 67.

The spelling of 806881909693 in words is "eight hundred six billion, eight hundred eighty-one million, nine hundred nine thousand, six hundred ninety-three".