855615816 has 96 divisors (see below), whose sum is σ = 2543486400. Its totient is φ = 257685120.

The previous prime is 855615811. The next prime is 855615821. The reversal of 855615816 is 618516558.

855615816 is a `hidden beast` number, since 8 + 5 + 5 + 61 + 581 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (855615811) and next prime (855615821).

It is not an unprimeable number, because it can be changed into a prime (855615811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129030 + ... + 135498.

It is an arithmetic number, because the mean of its divisors is an integer number (26494650).

Almost surely, 2^855615816 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 855615816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1271743200).

855615816 is an abundant number, since it is smaller than the sum of its proper divisors (1687870584).

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

855615816 is a wasteful number, since it uses less digits than its factorization.

855615816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659 (or 6652 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 855615816 is about 29250.9113704172. The cubic root of 855615816 is about 949.3498103221.

The spelling of 855615816 in words is "eight hundred fifty-five million, six hundred fifteen thousand, eight hundred sixteen".