18438591004545 has 16 divisors (see below), whose sum is σ = 29502711175680. Its totient is φ = 9833593346304.

The previous prime is 18438591004531. The next prime is 18438591004601. The reversal of 18438591004545 is 54540019583481.

It is not a de Polignac number, because 18438591004545 - 2⁶ = 18438591004481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19642065 + ... + 20559374.

It is an arithmetic number, because the mean of its divisors is an integer number (1843919448480).

Almost surely, 2^{18438591004545} is an apocalyptic number.

18438591004545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18438591004545 is a deficient number, since it is larger than the sum of its proper divisors (11064120171135).

18438591004545 is a wasteful number, since it uses less digits than its factorization.

18438591004545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40232024.

The product of its (nonzero) digits is 13824000, while the sum is 57.

The spelling of 18438591004545 in words is "eighteen trillion, four hundred thirty-eight billion, five hundred ninety-one million, four thousand, five hundred forty-five".