18604471889 has 4 divisors (see below), whose sum is σ = 19583654640. Its totient is φ = 17625289140.

The previous prime is 18604471859. The next prime is 18604471901. The reversal of 18604471889 is 98817440681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98817440681 = 107 ⋅923527483.

It is a cyclic number.

It is not a de Polignac number, because 18604471889 - 2²⁴ = 18587694673 is a prime.

It is a super-2 number, since 2×18604471889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18604471859) 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 3 ways as a sum of consecutive naturals, for example, 489591347 + ... + 489591384.

It is an arithmetic number, because the mean of its divisors is an integer number (4895913660).

Almost surely, 2^18604471889 is an apocalyptic number.

18604471889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18604471889 is a deficient number, since it is larger than the sum of its proper divisors (979182751).

18604471889 is an equidigital number, since it uses as much as digits as its factorization.

18604471889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979182750.

The product of its (nonzero) digits is 3096576, while the sum is 56.

The spelling of 18604471889 in words is "eighteen billion, six hundred four million, four hundred seventy-one thousand, eight hundred eighty-nine".