18135491359 has 12 divisors (see below), whose sum is σ = 19219256056. Its totient is φ = 17102883168.

The previous prime is 18135491239. The next prime is 18135491401. The reversal of 18135491359 is 95319453181.

It is a happy number.

It is not a de Polignac number, because 18135491359 - 2⁹ = 18135490847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18135491159) 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 in 11 ways as a sum of consecutive naturals, for example, 214584 + ... + 286909.

Almost surely, 2^18135491359 is an apocalyptic number.

18135491359 is a deficient number, since it is larger than the sum of its proper divisors (1083764697).

18135491359 is an equidigital number, since it uses as much as digits as its factorization.

18135491359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501594 (or 501565 counting only the distinct ones).

The product of its digits is 583200, while the sum is 49.

The spelling of 18135491359 in words is "eighteen billion, one hundred thirty-five million, four hundred ninety-one thousand, three hundred fifty-nine".