18617311641 has 8 divisors (see below), whose sum is σ = 25193576224. Its totient is φ = 12226294080.

The previous prime is 18617311639. The next prime is 18617311649. The reversal of 18617311641 is 14611371681.

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

It is not a de Polignac number, because 18617311641 - 2¹ = 18617311639 is a prime.

It is a super-2 number, since 2×18617311641² (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 18617311641.

It is not an unprimeable number, because it can be changed into a prime (18617311649) 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, 46311520 + ... + 46311921.

It is an arithmetic number, because the mean of its divisors is an integer number (3149197028).

Almost surely, 2^18617311641 is an apocalyptic number.

It is an amenable number.

18617311641 is a deficient number, since it is larger than the sum of its proper divisors (6576264583).

18617311641 is an equidigital number, since it uses as much as digits as its factorization.

18617311641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92623511.

The product of its digits is 24192, while the sum is 39.

The spelling of 18617311641 in words is "eighteen billion, six hundred seventeen million, three hundred eleven thousand, six hundred forty-one".