18631427826 has 64 divisors (see below), whose sum is σ = 41584306176. Its totient is φ = 5516577600.

The previous prime is 18631427821. The next prime is 18631427839. The reversal of 18631427826 is 62872413681.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18631427821) 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, 1989916 + ... + 1999256.

It is an arithmetic number, because the mean of its divisors is an integer number (649754784).

Almost surely, 2^18631427826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18631427826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20792153088).

18631427826 is an abundant number, since it is smaller than the sum of its proper divisors (22952878350).

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

18631427826 is a wasteful number, since it uses less digits than its factorization.

18631427826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10047.

The product of its digits is 774144, while the sum is 48.

The spelling of 18631427826 in words is "eighteen billion, six hundred thirty-one million, four hundred twenty-seven thousand, eight hundred twenty-six".