18424585729 has 16 divisors (see below), whose sum is σ = 20814542784. Its totient is φ = 16164158400.

The previous prime is 18424585721. The next prime is 18424585733. The reversal of 18424585729 is 92758542481.

It is a cyclic number.

It is not a de Polignac number, because 18424585729 - 2³ = 18424585721 is a prime.

It is a super-2 number, since 2×18424585729² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18424585729.

It is not an unprimeable number, because it can be changed into a prime (18424585721) 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 15 ways as a sum of consecutive naturals, for example, 223479 + ... + 294604.

It is an arithmetic number, because the mean of its divisors is an integer number (1300908924).

Almost surely, 2^18424585729 is an apocalyptic number.

It is an amenable number.

18424585729 is a deficient number, since it is larger than the sum of its proper divisors (2389957055).

18424585729 is a wasteful number, since it uses less digits than its factorization.

18424585729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518208.

The product of its digits is 6451200, while the sum is 55.

The spelling of 18424585729 in words is "eighteen billion, four hundred twenty-four million, five hundred eighty-five thousand, seven hundred twenty-nine".