18451319041 has 4 divisors (see below), whose sum is σ = 18504188500. Its totient is φ = 18398449584.

The previous prime is 18451318987. The next prime is 18451319111. The reversal of 18451319041 is 14091315481.

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 14609798641 + 3841520400 = 120871^2 + 61980^2 .

It is a cyclic number.

It is not a de Polignac number, because 18451319041 - 2²³ = 18442930433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18451319441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26434206 + ... + 26434903.

It is an arithmetic number, because the mean of its divisors is an integer number (4626047125).

Almost surely, 2^18451319041 is an apocalyptic number.

It is an amenable number.

18451319041 is a deficient number, since it is larger than the sum of its proper divisors (52869459).

18451319041 is an equidigital number, since it uses as much as digits as its factorization.

18451319041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52869458.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 18451319041 in words is "eighteen billion, four hundred fifty-one million, three hundred nineteen thousand, forty-one".