18385778288447 has 8 divisors (see below), whose sum is σ = 18422230016400. Its totient is φ = 18349327857024.

The previous prime is 18385778288411. The next prime is 18385778288459. The reversal of 18385778288447 is 74488287758381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18385778288447 - 2¹⁰ = 18385778287423 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 (18385778288047) 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 7 ways as a sum of consecutive naturals, for example, 31075079 + ... + 31661207.

It is an arithmetic number, because the mean of its divisors is an integer number (2302778752050).

Almost surely, 2^{18385778288447} is an apocalyptic number.

18385778288447 is a deficient number, since it is larger than the sum of its proper divisors (36451727953).

18385778288447 is an equidigital number, since it uses as much as digits as its factorization.

18385778288447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648265.

The product of its digits is 5394923520, while the sum is 80.

The spelling of 18385778288447 in words is "eighteen trillion, three hundred eighty-five billion, seven hundred seventy-eight million, two hundred eighty-eight thousand, four hundred forty-seven".