805512170000 has 50 divisors (see below), whose sum is σ = 1950225538998. Its totient is φ = 322204864000.

The previous prime is 805512169999. The next prime is 805512170077. The reversal of 805512170000 is 71215508.

It can be written as a sum of positive squares in 5 ways, for example, as 530193684736 + 275318485264 = 728144^2 + 524708^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40265609 + ... + 40285608.

Almost surely, 2^805512170000 is an apocalyptic number.

805512170000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

805512170000 is an abundant number, since it is smaller than the sum of its proper divisors (1144713368998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805512170000 is an equidigital number, since it uses as much as digits as its factorization.

805512170000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80551245 (or 80551224 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

Adding to 805512170000 its reverse (71215508), we get a palindrome (805583385508).

The spelling of 805512170000 in words is "eight hundred five billion, five hundred twelve million, one hundred seventy thousand".