18638868307 has 2 divisors, whose sum is σ = 18638868308. Its totient is φ = 18638868306.

The previous prime is 18638868301. The next prime is 18638868331. The reversal of 18638868307 is 70386883681.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18638868307 is a prime.

It is not a weakly prime, because it can be changed into another prime (18638868301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9319434153 + 9319434154.

It is an arithmetic number, because the mean of its divisors is an integer number (9319434154).

Almost surely, 2^18638868307 is an apocalyptic number.

18638868307 is a deficient number, since it is larger than the sum of its proper divisors (1).

18638868307 is an equidigital number, since it uses as much as digits as its factorization.

18638868307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 18638868307 in words is "eighteen billion, six hundred thirty-eight million, eight hundred sixty-eight thousand, three hundred seven".