853998782868 has 144 divisors (see below), whose sum is σ = 2784196920960. Its totient is φ = 214168953600.

The previous prime is 853998782807. The next prime is 853998782881. The reversal of 853998782868 is 868287899358.

853998782868 is a `hidden beast` number, since 8 + 539 + 9 + 8 + 78 + 2 + 8 + 6 + 8 = 666.

It is a super-2 number, since 2×853998782868² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5231343 + ... + 5392118.

It is an arithmetic number, because the mean of its divisors is an integer number (19334700840).

Almost surely, 2^853998782868 is an apocalyptic number.

It is an amenable number.

853998782868 is an abundant number, since it is smaller than the sum of its proper divisors (1930198138092).

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

853998782868 is a wasteful number, since it uses less digits than its factorization.

853998782868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623518 (or 10623513 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 81.

The spelling of 853998782868 in words is "eight hundred fifty-three billion, nine hundred ninety-eight million, seven hundred eighty-two thousand, eight hundred sixty-eight".