18478716489 has 16 divisors (see below), whose sum is σ = 27646928640. Its totient is φ = 12197170800.

The previous prime is 18478716439. The next prime is 18478716493. The reversal of 18478716489 is 98461787481.

18478716489 is a `hidden beast` number, since 1 + 84 + 7 + 8 + 71 + 6 + 489 = 666.

It is not a de Polignac number, because 18478716489 - 2⁸ = 18478716233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18478716439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3385377 + ... + 3390830.

It is an arithmetic number, because the mean of its divisors is an integer number (1727933040).

Almost surely, 2^18478716489 is an apocalyptic number.

It is an amenable number.

18478716489 is a deficient number, since it is larger than the sum of its proper divisors (9168212151).

18478716489 is a wasteful number, since it uses less digits than its factorization.

18478716489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776317 (or 6776311 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The spelling of 18478716489 in words is "eighteen billion, four hundred seventy-eight million, seven hundred sixteen thousand, four hundred eighty-nine".