858380166 has 80 divisors (see below), whose sum is σ = 2234395680. Its totient is φ = 241211520.

The previous prime is 858380093. The next prime is 858380177. The reversal of 858380166 is 661083858.

858380166 is a `hidden beast` number, since 8 + 583 + 8 + 0 + 1 + 66 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 62970 + ... + 75378.

It is an arithmetic number, because the mean of its divisors is an integer number (27929946).

Almost surely, 2^858380166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858380166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117197840).

858380166 is an abundant number, since it is smaller than the sum of its proper divisors (1376015514).

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

858380166 is a wasteful number, since it uses less digits than its factorization.

858380166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12491 (or 12482 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 858380166 is about 29298.1256397060. The cubic root of 858380166 is about 950.3711074588.

The spelling of 858380166 in words is "eight hundred fifty-eight million, three hundred eighty thousand, one hundred sixty-six".