809195216872 has 64 divisors (see below), whose sum is σ = 1790095564800. Its totient is φ = 335578921920.

The previous prime is 809195216857. The next prime is 809195216927. The reversal of 809195216872 is 278612591908.

It is a super-2 number, since 2×809195216872² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29434029 + ... + 29461507.

It is an arithmetic number, because the mean of its divisors is an integer number (27970243200).

Almost surely, 2^809195216872 is an apocalyptic number.

It is an amenable number.

809195216872 is an abundant number, since it is smaller than the sum of its proper divisors (980900347928).

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

809195216872 is a wasteful number, since it uses less digits than its factorization.

809195216872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44486 (or 44482 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 809195216872 in words is "eight hundred nine billion, one hundred ninety-five million, two hundred sixteen thousand, eight hundred seventy-two".