18200077849 has 2 divisors, whose sum is σ = 18200077850. Its totient is φ = 18200077848.

The previous prime is 18200077843. The next prime is 18200077937. The reversal of 18200077849 is 94877000281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12356545600 + 5843532249 = 111160^2 + 76443^2 .

It is a cyclic number.

It is not a de Polignac number, because 18200077849 - 2¹⁷ = 18199946777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18200077799 and 18200077808.

It is not a weakly prime, because it can be changed into another prime (18200077843) 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, 9100038924 + 9100038925.

It is an arithmetic number, because the mean of its divisors is an integer number (9100038925).

Almost surely, 2^18200077849 is an apocalyptic number.

It is an amenable number.

18200077849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18200077849 is an equidigital number, since it uses as much as digits as its factorization.

18200077849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 18200077849 in words is "eighteen billion, two hundred million, seventy-seven thousand, eight hundred forty-nine".