18406838054513 has 4 divisors (see below), whose sum is σ = 18414581783460. Its totient is φ = 18399094325568.

The previous prime is 18406838054483. The next prime is 18406838054519. The reversal of 18406838054513 is 31545083860481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3606136434289 + 14800701620224 = 1898983^2 + 3847168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18406838054513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18406838054519) 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, 3871860908 + ... + 3871865661.

It is an arithmetic number, because the mean of its divisors is an integer number (4603645445865).

Almost surely, 2^{18406838054513} is an apocalyptic number.

It is an amenable number.

18406838054513 is a deficient number, since it is larger than the sum of its proper divisors (7743728947).

18406838054513 is an equidigital number, since it uses as much as digits as its factorization.

18406838054513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7743728946.

The product of its (nonzero) digits is 11059200, while the sum is 56.

The spelling of 18406838054513 in words is "eighteen trillion, four hundred six billion, eight hundred thirty-eight million, fifty-four thousand, five hundred thirteen".