18008540669 has 16 divisors (see below), whose sum is σ = 21560409600. Its totient is φ = 14714953344.

The previous prime is 18008540591. The next prime is 18008540707. The reversal of 18008540669 is 96604580081.

It is a de Polignac number, because none of the positive numbers 2^k-18008540669 is a prime.

It is a super-2 number, since 2×18008540669² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008540369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545432 + ... + 577505.

It is an arithmetic number, because the mean of its divisors is an integer number (1347525600).

Almost surely, 2^18008540669 is an apocalyptic number.

It is an amenable number.

18008540669 is a deficient number, since it is larger than the sum of its proper divisors (3551868931).

18008540669 is a wasteful number, since it uses less digits than its factorization.

18008540669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123052.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 18008540669 in words is "eighteen billion, eight million, five hundred forty thousand, six hundred sixty-nine".