18499475849 has 2 divisors, whose sum is σ = 18499475850. Its totient is φ = 18499475848.

The previous prime is 18499475801. The next prime is 18499475857. The reversal of 18499475849 is 94857499481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13402229824 + 5097246025 = 115768^2 + 71395^2 .

It is a cyclic number.

It is not a de Polignac number, because 18499475849 - 2¹⁶ = 18499410313 is a prime.

It is not a weakly prime, because it can be changed into another prime (18499475879) 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, 9249737924 + 9249737925.

It is an arithmetic number, because the mean of its divisors is an integer number (9249737925).

Almost surely, 2^18499475849 is an apocalyptic number.

It is an amenable number.

18499475849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499475849 is an equidigital number, since it uses as much as digits as its factorization.

18499475849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104509440, while the sum is 68.

The spelling of 18499475849 in words is "eighteen billion, four hundred ninety-nine million, four hundred seventy-five thousand, eight hundred forty-nine".