855666666558 has 192 divisors, whose sum is σ = 2155624773120. Its totient is φ = 242730259200.

The previous prime is 855666666541. The next prime is 855666666629.

855666666558 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 101126448 + ... + 101134908.

It is an arithmetic number, because the mean of its divisors is an integer number (11227212360).

Almost surely, 2^855666666558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855666666558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077812386560).

855666666558 is an abundant number, since it is smaller than the sum of its proper divisors (1299958106562).

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

855666666558 is a wasteful number, since it uses less digits than its factorization.

855666666558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975 (or 8972 counting only the distinct ones).

The product of its digits is 1866240000, while the sum is 72.

The spelling of 855666666558 in words is "eight hundred fifty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred fifty-eight".