18711631207 has 2 divisors, whose sum is σ = 18711631208. Its totient is φ = 18711631206.

The previous prime is 18711631139. The next prime is 18711631219. The reversal of 18711631207 is 70213611781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18711631207 - 2²³ = 18703242599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18711631277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9355815603 + 9355815604.

It is an arithmetic number, because the mean of its divisors is an integer number (9355815604).

Almost surely, 2^18711631207 is an apocalyptic number.

18711631207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18711631207 is an equidigital number, since it uses as much as digits as its factorization.

18711631207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The spelling of 18711631207 in words is "eighteen billion, seven hundred eleven million, six hundred thirty-one thousand, two hundred seven".