23855686885 has 4 divisors (see below), whose sum is σ = 28626824268. Its totient is φ = 19084549504.

The previous prime is 23855686879. The next prime is 23855686889. The reversal of 23855686885 is 58868655832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6300231876 + 17555455009 = 79374^2 + 132497^2 .

It is a cyclic number.

It is not a de Polignac number, because 23855686885 - 2⁵ = 23855686853 is a prime.

It is a super-2 number, since 2×23855686885² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23855686889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385568684 + ... + 2385568693.

It is an arithmetic number, because the mean of its divisors is an integer number (7156706067).

Almost surely, 2^23855686885 is an apocalyptic number.

It is an amenable number.

23855686885 is a deficient number, since it is larger than the sum of its proper divisors (4771137383).

23855686885 is an equidigital number, since it uses as much as digits as its factorization.

23855686885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4771137382.

The product of its digits is 110592000, while the sum is 64.

The spelling of 23855686885 in words is "twenty-three billion, eight hundred fifty-five million, six hundred eighty-six thousand, eight hundred eighty-five".