18317729953 has 8 divisors (see below), whose sum is σ = 18389187368. Its totient is φ = 18246311424.

The previous prime is 18317729879. The next prime is 18317729957. The reversal of 18317729953 is 35992771381.

It can be written as a sum of positive squares in 4 ways, for example, as 2304 + 18317727649 = 48^2 + 135343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18317729953 - 2¹⁷ = 18317598881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18317729894 and 18317729903.

It is not an unprimeable number, because it can be changed into a prime (18317729957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242775 + ... + 1257427.

It is an arithmetic number, because the mean of its divisors is an integer number (2298648421).

Almost surely, 2^18317729953 is an apocalyptic number.

It is an amenable number.

18317729953 is a deficient number, since it is larger than the sum of its proper divisors (71457415).

18317729953 is a wasteful number, since it uses less digits than its factorization.

18317729953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19443.

The product of its digits is 2857680, while the sum is 55.

The spelling of 18317729953 in words is "eighteen billion, three hundred seventeen million, seven hundred twenty-nine thousand, nine hundred fifty-three".