18499180849 has 2 divisors, whose sum is σ = 18499180850. Its totient is φ = 18499180848.

The previous prime is 18499180831. The next prime is 18499180877. The reversal of 18499180849 is 94808199481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10561261824 + 7937919025 = 102768^2 + 89095^2 .

It is an emirp because it is prime and its reverse (94808199481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18499180849 - 2¹⁵ = 18499148081 is a prime.

It is not a weakly prime, because it can be changed into another prime (18499180879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249590424 + 9249590425.

It is an arithmetic number, because the mean of its divisors is an integer number (9249590425).

Almost surely, 2^18499180849 is an apocalyptic number.

It is an amenable number.

18499180849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499180849 is an equidigital number, since it uses as much as digits as its factorization.

18499180849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 61.

The spelling of 18499180849 in words is "eighteen billion, four hundred ninety-nine million, one hundred eighty thousand, eight hundred forty-nine".