18026841449 has 2 divisors, whose sum is σ = 18026841450. Its totient is φ = 18026841448.

The previous prime is 18026841439. The next prime is 18026841461. The reversal of 18026841449 is 94414862081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16266451600 + 1760389849 = 127540^2 + 41957^2 .

It is a cyclic number.

It is not a de Polignac number, because 18026841449 - 2⁴ = 18026841433 is a prime.

It is not a weakly prime, because it can be changed into another prime (18026841439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013420724 + 9013420725.

It is an arithmetic number, because the mean of its divisors is an integer number (9013420725).

Almost surely, 2^18026841449 is an apocalyptic number.

It is an amenable number.

18026841449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18026841449 is an equidigital number, since it uses as much as digits as its factorization.

18026841449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 47.

The spelling of 18026841449 in words is "eighteen billion, twenty-six million, eight hundred forty-one thousand, four hundred forty-nine".