18038845440001 has 4 divisors (see below), whose sum is σ = 18039768587604. Its totient is φ = 18037922292400.

The previous prime is 18038845439983. The next prime is 18038845440019. The reversal of 18038845440001 is 10004454883081.

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

It is an interprime number because it is at equal distance from previous prime (18038845439983) and next prime (18038845440019).

It can be written as a sum of positive squares in 2 ways, for example, as 11735256056976 + 6303589383025 = 3425676^2 + 2510695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18038845440001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038845440061) 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, 461544490 + ... + 461583571.

It is an arithmetic number, because the mean of its divisors is an integer number (4509942146901).

Almost surely, 2^{18038845440001} is an apocalyptic number.

It is an amenable number.

18038845440001 is a deficient number, since it is larger than the sum of its proper divisors (923147603).

18038845440001 is an equidigital number, since it uses as much as digits as its factorization.

18038845440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923147602.

The product of its (nonzero) digits is 491520, while the sum is 46.

The spelling of 18038845440001 in words is "eighteen trillion, thirty-eight billion, eight hundred forty-five million, four hundred forty thousand, one".