18689255919 has 6 divisors (see below), whose sum is σ = 26995591896. Its totient is φ = 12459503940.

The previous prime is 18689255917. The next prime is 18689255927. The reversal of 18689255919 is 91955298681.

18689255919 is a `hidden beast` number, since 1 + 8 + 68 + 9 + 2 + 559 + 19 = 666.

It is not a de Polignac number, because 18689255919 - 2¹ = 18689255917 is a prime.

It is a super-2 number, since 2×18689255919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18689255911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038291987 + ... + 1038292004.

It is an arithmetic number, because the mean of its divisors is an integer number (4499265316).

Almost surely, 2^18689255919 is an apocalyptic number.

18689255919 is a deficient number, since it is larger than the sum of its proper divisors (8306335977).

18689255919 is a wasteful number, since it uses less digits than its factorization.

18689255919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076583997 (or 2076583994 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 63.

The spelling of 18689255919 in words is "eighteen billion, six hundred eighty-nine million, two hundred fifty-five thousand, nine hundred nineteen".