18619027849 has 2 divisors, whose sum is σ = 18619027850. Its totient is φ = 18619027848.

The previous prime is 18619027799. The next prime is 18619027879. The reversal of 18619027849 is 94872091681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15349475449 + 3269552400 = 123893^2 + 57180^2 .

It is a cyclic number.

It is not a de Polignac number, because 18619027849 - 2¹¹ = 18619025801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18619027849.

It is not a weakly prime, because it can be changed into another prime (18619027879) 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, 9309513924 + 9309513925.

It is an arithmetic number, because the mean of its divisors is an integer number (9309513925).

Almost surely, 2^18619027849 is an apocalyptic number.

It is an amenable number.

18619027849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18619027849 is an equidigital number, since it uses as much as digits as its factorization.

18619027849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 18619027849 in words is "eighteen billion, six hundred nineteen million, twenty-seven thousand, eight hundred forty-nine".