18881059609 has 16 divisors (see below), whose sum is σ = 20654000640. Its totient is φ = 17211600000.

The previous prime is 18881059591. The next prime is 18881059621. The reversal of 18881059609 is 90695018881.

It is a cyclic number.

It is not a de Polignac number, because 18881059609 - 2⁵ = 18881059577 is a prime.

It is a super-2 number, since 2×18881059609² (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 18881059609.

It is not an unprimeable number, because it can be changed into a prime (18881059649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219267 + ... + 292984.

It is an arithmetic number, because the mean of its divisors is an integer number (1290875040).

Almost surely, 2^18881059609 is an apocalyptic number.

It is an amenable number.

18881059609 is a deficient number, since it is larger than the sum of its proper divisors (1772941031).

18881059609 is a wasteful number, since it uses less digits than its factorization.

18881059609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512352.

The product of its (nonzero) digits is 1244160, while the sum is 55.

The spelling of 18881059609 in words is "eighteen billion, eight hundred eighty-one million, fifty-nine thousand, six hundred nine".