18998088289 has 4 divisors (see below), whose sum is σ = 19175640624. Its totient is φ = 18820535956.

The previous prime is 18998088281. The next prime is 18998088293. The reversal of 18998088289 is 98288089981.

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: 98288089981 = 198281 ⋅495701.

It is a cyclic number.

It is not a de Polignac number, because 18998088289 - 2³ = 18998088281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18998088281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88776007 + ... + 88776220.

It is an arithmetic number, because the mean of its divisors is an integer number (4793910156).

Almost surely, 2^18998088289 is an apocalyptic number.

It is an amenable number.

18998088289 is a deficient number, since it is larger than the sum of its proper divisors (177552335).

18998088289 is a wasteful number, since it uses less digits than its factorization.

18998088289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177552334.

The product of its (nonzero) digits is 47775744, while the sum is 70.

The spelling of 18998088289 in words is "eighteen billion, nine hundred ninety-eight million, eighty-eight thousand, two hundred eighty-nine".