800086436509 has 2 divisors, whose sum is σ = 800086436510. Its totient is φ = 800086436508.

The previous prime is 800086436477. The next prime is 800086436549. The reversal of 800086436509 is 905634680008.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607966397284 + 192120039225 = 779722^2 + 438315^2 .

It is a cyclic number.

It is not a de Polignac number, because 800086436509 - 2⁵ = 800086436477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (800086436549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400043218254 + 400043218255.

It is an arithmetic number, because the mean of its divisors is an integer number (400043218255).

Almost surely, 2^800086436509 is an apocalyptic number.

It is an amenable number.

800086436509 is a deficient number, since it is larger than the sum of its proper divisors (1).

800086436509 is an equidigital number, since it uses as much as digits as its factorization.

800086436509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 800086436509 in words is "eight hundred billion, eighty-six million, four hundred thirty-six thousand, five hundred nine".