18568385669 has 8 divisors (see below), whose sum is σ = 19214742360. Its totient is φ = 17922433536.

The previous prime is 18568385651. The next prime is 18568385699. The reversal of 18568385669 is 96658386581.

It can be written as a sum of positive squares in 4 ways, for example, as 4797363169 + 13771022500 = 69263^2 + 117350^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18568385669 is a prime.

It is a super-2 number, since 2×18568385669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18568385699) 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, 6224 + ... + 192809.

It is an arithmetic number, because the mean of its divisors is an integer number (2401842795).

Almost surely, 2^18568385669 is an apocalyptic number.

It is an amenable number.

18568385669 is a deficient number, since it is larger than the sum of its proper divisors (646356691).

18568385669 is a wasteful number, since it uses less digits than its factorization.

18568385669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202279.

The product of its digits is 74649600, while the sum is 65.

The spelling of 18568385669 in words is "eighteen billion, five hundred sixty-eight million, three hundred eighty-five thousand, six hundred sixty-nine".