18006918471617 has 8 divisors (see below), whose sum is σ = 18059079229800. Its totient is φ = 17954760942720.

The previous prime is 18006918471571. The next prime is 18006918471629. The reversal of 18006918471617 is 71617481960081.

It can be written as a sum of positive squares in 4 ways, for example, as 10508171540161 + 7498746931456 = 3241631^2 + 2738384^2 .

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 18006918471617 - 2¹² = 18006918467521 is a prime.

It is a super-2 number, since 2×18006918471617² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18006918471317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10593893 + ... + 12175565.

It is an arithmetic number, because the mean of its divisors is an integer number (2257384903725).

Almost surely, 2^{18006918471617} is an apocalyptic number.

It is an amenable number.

18006918471617 is a deficient number, since it is larger than the sum of its proper divisors (52160758183).

18006918471617 is a wasteful number, since it uses less digits than its factorization.

18006918471617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614643.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 18006918471617 in words is "eighteen trillion, six billion, nine hundred eighteen million, four hundred seventy-one thousand, six hundred seventeen".