18817351438 has 12 divisors (see below), whose sum is σ = 28587860280. Its totient is φ = 9289572396.

The previous prime is 18817351433. The next prime is 18817351471. The reversal of 18817351438 is 83415371881.

It is a junction number, because it is equal to n+sod(n) for n = 18817351391 and 18817351400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18817351433) 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 5 ways as a sum of consecutive naturals, for example, 741298 + ... + 766261.

It is an arithmetic number, because the mean of its divisors is an integer number (2382321690).

Almost surely, 2^18817351438 is an apocalyptic number.

18817351438 is a deficient number, since it is larger than the sum of its proper divisors (9770508842).

18817351438 is an equidigital number, since it uses as much as digits as its factorization.

18817351438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507719 (or 1507640 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The spelling of 18817351438 in words is "eighteen billion, eight hundred seventeen million, three hundred fifty-one thousand, four hundred thirty-eight".