18243564878 has 32 divisors (see below), whose sum is σ = 34598389248. Its totient is φ = 7007767200.

The previous prime is 18243564853. The next prime is 18243564887. The reversal of 18243564878 is 87846534281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 823325 + ... + 845192.

It is an arithmetic number, because the mean of its divisors is an integer number (1081199664).

Almost surely, 2^18243564878 is an apocalyptic number.

18243564878 is a deficient number, since it is larger than the sum of its proper divisors (16354824370).

18243564878 is a wasteful number, since it uses less digits than its factorization.

18243564878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668608.

The product of its digits is 10321920, while the sum is 56.

The spelling of 18243564878 in words is "eighteen billion, two hundred forty-three million, five hundred sixty-four thousand, eight hundred seventy-eight".