18006637643 has 8 divisors (see below), whose sum is σ = 19072418112. Its totient is φ = 16941586816.

The previous prime is 18006637613. The next prime is 18006637657. The reversal of 18006637643 is 34673660081.

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 18006637643 - 2²⁰ = 18005589067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18006637594 and 18006637603.

It is not an unprimeable number, because it can be changed into a prime (18006637613) 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 7 ways as a sum of consecutive naturals, for example, 131180 + ... + 230697.

It is an arithmetic number, because the mean of its divisors is an integer number (2384052264).

Almost surely, 2^18006637643 is an apocalyptic number.

18006637643 is a deficient number, since it is larger than the sum of its proper divisors (1065780469).

18006637643 is a wasteful number, since it uses less digits than its factorization.

18006637643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364821.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 18006637643 in words is "eighteen billion, six million, six hundred thirty-seven thousand, six hundred forty-three".