18121302049 has 2 divisors, whose sum is σ = 18121302050. Its totient is φ = 18121302048.

The previous prime is 18121302029. The next prime is 18121302083. The reversal of 18121302049 is 94020312181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10771326225 + 7349975824 = 103785^2 + 85732^2 .

It is a cyclic number.

It is not a de Polignac number, because 18121302049 - 2²⁷ = 17987084321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18121302049.

It is not a weakly prime, because it can be changed into another prime (18121302019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060651024 + 9060651025.

It is an arithmetic number, because the mean of its divisors is an integer number (9060651025).

Almost surely, 2^18121302049 is an apocalyptic number.

It is an amenable number.

18121302049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18121302049 is an equidigital number, since it uses as much as digits as its factorization.

18121302049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 18121302049 in words is "eighteen billion, one hundred twenty-one million, three hundred two thousand, forty-nine".