18898089881 has 24 divisors (see below), whose sum is σ = 21123238752. Its totient is φ = 16890825600.

The previous prime is 18898089869. The next prime is 18898089887.

18898089881 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18898089881 - 2¹⁰ = 18898088857 is a prime.

It is a super-2 number, since 2×18898089881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18898089887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4805486 + ... + 4809416.

It is an arithmetic number, because the mean of its divisors is an integer number (880134948).

Almost surely, 2^18898089881 is an apocalyptic number.

18898089881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18898089881 is a deficient number, since it is larger than the sum of its proper divisors (2225148871).

18898089881 is a wasteful number, since it uses less digits than its factorization.

18898089881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613 (or 4602 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 68.

The spelling of 18898089881 in words is "eighteen billion, eight hundred ninety-eight million, eighty-nine thousand, eight hundred eighty-one".