858109711873 has 4 divisors (see below), whose sum is σ = 878065751728. Its totient is φ = 838153672020.

The previous prime is 858109711819. The next prime is 858109711883. The reversal of 858109711873 is 378117901858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858109711873 is a prime.

It is a super-2 number, since 2×858109711873² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858109711883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9978019863 + ... + 9978019948.

It is an arithmetic number, because the mean of its divisors is an integer number (219516437932).

Almost surely, 2^858109711873 is an apocalyptic number.

It is an amenable number.

858109711873 is a deficient number, since it is larger than the sum of its proper divisors (19956039855).

858109711873 is a wasteful number, since it uses less digits than its factorization.

858109711873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19956039854.

The product of its (nonzero) digits is 3386880, while the sum is 58.

The spelling of 858109711873 in words is "eight hundred fifty-eight billion, one hundred nine million, seven hundred eleven thousand, eight hundred seventy-three".