18518722428 has 12 divisors (see below), whose sum is σ = 43210352360. Its totient is φ = 6172907472.

The previous prime is 18518722423. The next prime is 18518722429. The reversal of 18518722428 is 82422781581.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518722423) 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, 771613423 + ... + 771613446.

Almost surely, 2^18518722428 is an apocalyptic number.

It is an amenable number.

18518722428 is an abundant number, since it is smaller than the sum of its proper divisors (24691629932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18518722428 is a wasteful number, since it uses less digits than its factorization.

18518722428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543226876 (or 1543226874 counting only the distinct ones).

The product of its digits is 573440, while the sum is 48.

The spelling of 18518722428 in words is "eighteen billion, five hundred eighteen million, seven hundred twenty-two thousand, four hundred twenty-eight".