18687244427207 has 2 divisors, whose sum is σ = 18687244427208. Its totient is φ = 18687244427206.

The previous prime is 18687244427171. The next prime is 18687244427209. The reversal of 18687244427207 is 70272444278681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18687244427207 - 2²⁶ = 18687177318343 is a prime.

Together with 18687244427209, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18687244427207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18687244427209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343622213603 + 9343622213604.

It is an arithmetic number, because the mean of its divisors is an integer number (9343622213604).

Almost surely, 2^{18687244427207} is an apocalyptic number.

18687244427207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18687244427207 is an equidigital number, since it uses as much as digits as its factorization.

18687244427207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67436544, while the sum is 62.

The spelling of 18687244427207 in words is "eighteen trillion, six hundred eighty-seven billion, two hundred forty-four million, four hundred twenty-seven thousand, two hundred seven".