855138816 has 160 divisors (see below), whose sum is σ = 2893207680. Its totient is φ = 244297728.

The previous prime is 855138799. The next prime is 855138841. The reversal of 855138816 is 618831558.

855138816 is a `hidden beast` number, since 8 + 551 + 3 + 88 + 16 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92350 + ... + 101186.

It is an arithmetic number, because the mean of its divisors is an integer number (18082548).

Almost surely, 2^855138816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855138816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446603840).

855138816 is an abundant number, since it is smaller than the sum of its proper divisors (2038068864).

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

855138816 is an equidigital number, since it uses as much as digits as its factorization.

855138816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871 (or 8849 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 855138816 is about 29242.7566416027. The cubic root of 855138816 is about 949.1733588397.

The spelling of 855138816 in words is "eight hundred fifty-five million, one hundred thirty-eight thousand, eight hundred sixteen".