18044511851 has 2 divisors, whose sum is σ = 18044511852. Its totient is φ = 18044511850.

The previous prime is 18044511847. The next prime is 18044511857. The reversal of 18044511851 is 15811544081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18044511851 - 2² = 18044511847 is a prime.

It is not a weakly prime, because it can be changed into another prime (18044511857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022255925 + 9022255926.

It is an arithmetic number, because the mean of its divisors is an integer number (9022255926).

Almost surely, 2^18044511851 is an apocalyptic number.

18044511851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18044511851 is an equidigital number, since it uses as much as digits as its factorization.

18044511851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25600, while the sum is 38.

The spelling of 18044511851 in words is "eighteen billion, forty-four million, five hundred eleven thousand, eight hundred fifty-one".