18515317063 has 2 divisors, whose sum is σ = 18515317064. Its totient is φ = 18515317062.

The previous prime is 18515317031. The next prime is 18515317097. The reversal of 18515317063 is 36071351581.

It is a weak prime.

It is an emirp because it is prime and its reverse (36071351581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18515317063 - 2⁵ = 18515317031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18515317463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9257658531 + 9257658532.

It is an arithmetic number, because the mean of its divisors is an integer number (9257658532).

Almost surely, 2^18515317063 is an apocalyptic number.

18515317063 is a deficient number, since it is larger than the sum of its proper divisors (1).

18515317063 is an equidigital number, since it uses as much as digits as its factorization.

18515317063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 18515317063 in words is "eighteen billion, five hundred fifteen million, three hundred seventeen thousand, sixty-three".