2173858866 has 24 divisors (see below), whose sum is σ = 4754050704. Its totient is φ = 717846840.

The previous prime is 2173858847. The next prime is 2173858889. The reversal of 2173858866 is 6688583712.

2173858866 is a `hidden beast` number, since 21 + 7 + 38 + 588 + 6 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562420 + ... + 566271.

It is an arithmetic number, because the mean of its divisors is an integer number (198085446).

Almost surely, 2^2173858866 is an apocalyptic number.

2173858866 is an abundant number, since it is smaller than the sum of its proper divisors (2580191838).

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

2173858866 is a wasteful number, since it uses less digits than its factorization.

2173858866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128806 (or 1128803 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The square root of 2173858866 is about 46624.6594196676. The cubic root of 2173858866 is about 1295.4195538860.

The spelling of 2173858866 in words is "two billion, one hundred seventy-three million, eight hundred fifty-eight thousand, eight hundred sixty-six".