809541568020 has 24 divisors (see below), whose sum is σ = 2266716390624. Its totient is φ = 215877751456.

The previous prime is 809541567979. The next prime is 809541568027. The reversal of 809541568020 is 20865145908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809541568027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6746179674 + ... + 6746179793.

It is an arithmetic number, because the mean of its divisors is an integer number (94446516276).

Almost surely, 2^809541568020 is an apocalyptic number.

It is an amenable number.

809541568020 is an abundant number, since it is smaller than the sum of its proper divisors (1457174822604).

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

809541568020 is a wasteful number, since it uses less digits than its factorization.

809541568020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13492359479 (or 13492359477 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 809541568020 in words is "eight hundred nine billion, five hundred forty-one million, five hundred sixty-eight thousand, twenty".