18408460387103 has 4 divisors (see below), whose sum is σ = 19043234883240. Its totient is φ = 17773685890968.

The previous prime is 18408460387087. The next prime is 18408460387139. The reversal of 18408460387103 is 30178306480481.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18408460387103 - 2⁴ = 18408460387087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408460387403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317387248025 + ... + 317387248082.

It is an arithmetic number, because the mean of its divisors is an integer number (4760808720810).

Almost surely, 2^{18408460387103} is an apocalyptic number.

18408460387103 is a deficient number, since it is larger than the sum of its proper divisors (634774496137).

18408460387103 is an equidigital number, since it uses as much as digits as its factorization.

18408460387103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634774496136.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 18408460387103 in words is "eighteen trillion, four hundred eight billion, four hundred sixty million, three hundred eighty-seven thousand, one hundred three".