858165660 has 144 divisors (see below), whose sum is σ = 2858244480. Its totient is φ = 206686080.

The previous prime is 858165643. The next prime is 858165713. The reversal of 858165660 is 66561858.

858165660 is a `hidden beast` number, since 8 + 5 + 81 + 6 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321411 + ... + 324069.

It is an arithmetic number, because the mean of its divisors is an integer number (19848920).

Almost surely, 2^858165660 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 858165660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1429122240).

858165660 is an abundant number, since it is smaller than the sum of its proper divisors (2000078820).

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

858165660 is a wasteful number, since it uses less digits than its factorization.

858165660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848 (or 2843 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 858165660 is about 29294.4646648475. The cubic root of 858165660 is about 950.2919361326.

The spelling of 858165660 in words is "eight hundred fifty-eight million, one hundred sixty-five thousand, six hundred sixty".