806290975815817 has 2 divisors, whose sum is σ = 806290975815818. Its totient is φ = 806290975815816.

The previous prime is 806290975815749. The next prime is 806290975815863. The reversal of 806290975815817 is 718518579092608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735315473123401 + 70975502692416 = 27116701^2 + 8424696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806290975815817 is a prime.

It is not a weakly prime, because it can be changed into another prime (806290975815617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403145487907908 + 403145487907909.

It is an arithmetic number, because the mean of its divisors is an integer number (403145487907909).

Almost surely, 2^{806290975815817} is an apocalyptic number.

It is an amenable number.

806290975815817 is a deficient number, since it is larger than the sum of its proper divisors (1).

806290975815817 is an equidigital number, since it uses as much as digits as its factorization.

806290975815817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 609638400, while the sum is 76.

The spelling of 806290975815817 in words is "eight hundred six trillion, two hundred ninety billion, nine hundred seventy-five million, eight hundred fifteen thousand, eight hundred seventeen".