855831138558 has 64 divisors (see below), whose sum is σ = 1897679798784. Its totient is φ = 255134768000.

The previous prime is 855831138541. The next prime is 855831138647.

It is a happy number.

855831138558 is nontrivially palindromic in base 10.

855831138558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1962160 + ... + 2358332.

It is an arithmetic number, because the mean of its divisors is an integer number (29651246856).

Almost surely, 2^855831138558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855831138558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (948839899392).

855831138558 is an abundant number, since it is smaller than the sum of its proper divisors (1041848660226).

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

855831138558 is a wasteful number, since it uses less digits than its factorization.

855831138558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396721.

The product of its digits is 23040000, while the sum is 60.

The spelling of 855831138558 in words is "eight hundred fifty-five billion, eight hundred thirty-one million, one hundred thirty-eight thousand, five hundred fifty-eight".