808991978208 has 96 divisors (see below), whose sum is σ = 2258173191456. Its totient is φ = 252712009728.

The previous prime is 808991978203. The next prime is 808991978209. The reversal of 808991978208 is 802879199808.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808991978203) 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 in 15 ways as a sum of consecutive naturals, for example, 683491 + ... + 1444002.

It is an arithmetic number, because the mean of its divisors is an integer number (23522637411).

Almost surely, 2^808991978208 is an apocalyptic number.

It is an amenable number.

808991978208 is an abundant number, since it is smaller than the sum of its proper divisors (1449181213248).

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

808991978208 is a wasteful number, since it uses less digits than its factorization.

808991978208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127756 (or 2127748 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 69.

The spelling of 808991978208 in words is "eight hundred eight billion, nine hundred ninety-one million, nine hundred seventy-eight thousand, two hundred eight".