806997167209 has 2 divisors, whose sum is σ = 806997167210. Its totient is φ = 806997167208.

The previous prime is 806997167203. The next prime is 806997167219. The reversal of 806997167209 is 902761799608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490275838809 + 316721328400 = 700197^2 + 562780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806997167209 is a prime.

It is not a weakly prime, because it can be changed into another prime (806997167203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403498583604 + 403498583605.

It is an arithmetic number, because the mean of its divisors is an integer number (403498583605).

Almost surely, 2^806997167209 is an apocalyptic number.

It is an amenable number.

806997167209 is a deficient number, since it is larger than the sum of its proper divisors (1).

806997167209 is an equidigital number, since it uses as much as digits as its factorization.

806997167209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 806997167209 in words is "eight hundred six billion, nine hundred ninety-seven million, one hundred sixty-seven thousand, two hundred nine".