13818906381647 has 4 divisors (see below), whose sum is σ = 13818913843176. Its totient is φ = 13818898920120.

The previous prime is 13818906381557. The next prime is 13818906381673. The reversal of 13818906381647 is 74618360981831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13818906381647 - 2³⁸ = 13544028474703 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 (13818906383647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391768 + ... + 5438274.

It is an arithmetic number, because the mean of its divisors is an integer number (3454728460794).

Almost surely, 2^{13818906381647} is an apocalyptic number.

13818906381647 is a deficient number, since it is larger than the sum of its proper divisors (7461529).

13818906381647 is an equidigital number, since it uses as much as digits as its factorization.

13818906381647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7461528.

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 13818906381647 in words is "thirteen trillion, eight hundred eighteen billion, nine hundred six million, three hundred eighty-one thousand, six hundred forty-seven".