18953135317 has 2 divisors, whose sum is σ = 18953135318. Its totient is φ = 18953135316.

The previous prime is 18953135273. The next prime is 18953135323. The reversal of 18953135317 is 71353135981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16591758481 + 2361376836 = 128809^2 + 48594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18953135317 - 2³¹ = 16805651669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18953135347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9476567658 + 9476567659.

It is an arithmetic number, because the mean of its divisors is an integer number (9476567659).

Almost surely, 2^18953135317 is an apocalyptic number.

It is an amenable number.

18953135317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18953135317 is an equidigital number, since it uses as much as digits as its factorization.

18953135317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The spelling of 18953135317 in words is "eighteen billion, nine hundred fifty-three million, one hundred thirty-five thousand, three hundred seventeen".