18825851681 has 32 divisors (see below), whose sum is σ = 24406045440. Its totient is φ = 14101807104.

The previous prime is 18825851669. The next prime is 18825851701. The reversal of 18825851681 is 18615852881.

It is not a de Polignac number, because 18825851681 - 2⁶ = 18825851617 is a prime.

It is a super-2 number, since 2×18825851681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18825853681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3650801 + ... + 3655953.

It is an arithmetic number, because the mean of its divisors is an integer number (762688920).

Almost surely, 2^18825851681 is an apocalyptic number.

It is an amenable number.

18825851681 is a deficient number, since it is larger than the sum of its proper divisors (5580193759).

18825851681 is a wasteful number, since it uses less digits than its factorization.

18825851681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7305.

The product of its digits is 1228800, while the sum is 53.

The spelling of 18825851681 in words is "eighteen billion, eight hundred twenty-five million, eight hundred fifty-one thousand, six hundred eighty-one".