18487407786209 has 2 divisors, whose sum is σ = 18487407786210. Its totient is φ = 18487407786208.

The previous prime is 18487407786187. The next prime is 18487407786229. The reversal of 18487407786209 is 90268770478481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10504748656609 + 7982659129600 = 3241103^2 + 2825360^2 .

It is a cyclic number.

It is not a de Polignac number, because 18487407786209 - 2⁸ = 18487407785953 is a prime.

It is not a weakly prime, because it can be changed into another prime (18487407786229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243703893104 + 9243703893105.

It is an arithmetic number, because the mean of its divisors is an integer number (9243703893105).

Almost surely, 2^{18487407786209} is an apocalyptic number.

It is an amenable number.

18487407786209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18487407786209 is an equidigital number, since it uses as much as digits as its factorization.

18487407786209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 303464448, while the sum is 71.

The spelling of 18487407786209 in words is "eighteen trillion, four hundred eighty-seven billion, four hundred seven million, seven hundred eighty-six thousand, two hundred nine".