18678842049 has 16 divisors (see below), whose sum is σ = 28637622272. Its totient is φ = 10608139728.

The previous prime is 18678842027. The next prime is 18678842051. The reversal of 18678842049 is 94024887681.

It is not a de Polignac number, because 18678842049 - 2⁷ = 18678841921 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18678842049.

It is not an unprimeable number, because it can be changed into a prime (18678842059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2725009 + ... + 2731854.

It is an arithmetic number, because the mean of its divisors is an integer number (1789851392).

Almost surely, 2^18678842049 is an apocalyptic number.

It is an amenable number.

18678842049 is a deficient number, since it is larger than the sum of its proper divisors (9958780223).

18678842049 is a wasteful number, since it uses less digits than its factorization.

18678842049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5457036.

The product of its (nonzero) digits is 6193152, while the sum is 57.

The spelling of 18678842049 in words is "eighteen billion, six hundred seventy-eight million, eight hundred forty-two thousand, forty-nine".