807804217805 has 16 divisors (see below), whose sum is σ = 1105339347504. Its totient is φ = 561442206720.

The previous prime is 807804217793. The next prime is 807804217823. The reversal of 807804217805 is 508712408708.

It can be written as a sum of positive squares in 8 ways, for example, as 37352133289 + 770452084516 = 193267^2 + 877754^2 .

It is not a de Polignac number, because 807804217805 - 2⁴ = 807804217789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365521166 + ... + 365523375.

It is an arithmetic number, because the mean of its divisors is an integer number (69083709219).

Almost surely, 2^807804217805 is an apocalyptic number.

807804217805 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

807804217805 is a deficient number, since it is larger than the sum of its proper divisors (297535129699).

807804217805 is a wasteful number, since it uses less digits than its factorization.

807804217805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731044576.

The product of its (nonzero) digits is 1003520, while the sum is 50.

The spelling of 807804217805 in words is "eight hundred seven billion, eight hundred four million, two hundred seventeen thousand, eight hundred five".