805816187872 has 12 divisors (see below), whose sum is σ = 1586450619936. Its totient is φ = 402908093920.

The previous prime is 805816187773. The next prime is 805816187873. The reversal of 805816187872 is 278781618508.

It is a self number, because there is not a number n which added to its sum of digits gives 805816187872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805816187873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12590877904 + ... + 12590877967.

It is an arithmetic number, because the mean of its divisors is an integer number (132204218328).

Almost surely, 2^805816187872 is an apocalyptic number.

It is an amenable number.

805816187872 is a deficient number, since it is larger than the sum of its proper divisors (780634432064).

805816187872 is a wasteful number, since it uses less digits than its factorization.

805816187872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25181755881 (or 25181755873 counting only the distinct ones).

The product of its (nonzero) digits is 12042240, while the sum is 61.

The spelling of 805816187872 in words is "eight hundred five billion, eight hundred sixteen million, one hundred eighty-seven thousand, eight hundred seventy-two".