18500017513 has 2 divisors, whose sum is σ = 18500017514. Its totient is φ = 18500017512.

The previous prime is 18500017511. The next prime is 18500017567. The reversal of 18500017513 is 31571000581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18498176064 + 1841449 = 136008^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500017513 - 2¹ = 18500017511 is a prime.

Together with 18500017511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18500017511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250008756 + 9250008757.

It is an arithmetic number, because the mean of its divisors is an integer number (9250008757).

Almost surely, 2^18500017513 is an apocalyptic number.

It is an amenable number.

18500017513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18500017513 is an equidigital number, since it uses as much as digits as its factorization.

18500017513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 18500017513 in words is "eighteen billion, five hundred million, seventeen thousand, five hundred thirteen".