18881887889 has 16 divisors (see below), whose sum is σ = 19255982592. Its totient is φ = 18512540928.

The previous prime is 18881887883. The next prime is 18881887897. The reversal of 18881887889 is 98878818881.

It is a cyclic number.

It is not a de Polignac number, because 18881887889 - 2¹⁶ = 18881822353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18881887883) 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, 4105139 + ... + 4109735.

It is an arithmetic number, because the mean of its divisors is an integer number (1203498912).

Almost surely, 2^18881887889 is an apocalyptic number.

It is an amenable number.

18881887889 is a deficient number, since it is larger than the sum of its proper divisors (374094703).

18881887889 is a wasteful number, since it uses less digits than its factorization.

18881887889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096.

The product of its digits is 132120576, while the sum is 74.

The spelling of 18881887889 in words is "eighteen billion, eight hundred eighty-one million, eight hundred eighty-seven thousand, eight hundred eighty-nine".