11187172858 has 8 divisors (see below), whose sum is σ = 16782471828. Its totient is φ = 5593015584.

The previous prime is 11187172823. The next prime is 11187172859. The reversal of 11187172858 is 85827178111.

It can be written as a sum of positive squares in 2 ways, for example, as 11003380609 + 183792249 = 104897^2 + 13557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (11187172859) 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, 260491 + ... + 300382.

Almost surely, 2^11187172858 is an apocalyptic number.

11187172858 is a deficient number, since it is larger than the sum of its proper divisors (5595298970).

11187172858 is an equidigital number, since it uses as much as digits as its factorization.

11187172858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570848.

The product of its digits is 250880, while the sum is 49.

The spelling of 11187172858 in words is "eleven billion, one hundred eighty-seven million, one hundred seventy-two thousand, eight hundred fifty-eight".