18542557211 has 4 divisors (see below), whose sum is σ = 18542829624. Its totient is φ = 18542284800.

The previous prime is 18542557207. The next prime is 18542557219. The reversal of 18542557211 is 11275524581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18542557211 - 2² = 18542557207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18542557219) 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, 63476 + ... + 202766.

It is an arithmetic number, because the mean of its divisors is an integer number (4635707406).

Almost surely, 2^18542557211 is an apocalyptic number.

18542557211 is a deficient number, since it is larger than the sum of its proper divisors (272413).

18542557211 is a wasteful number, since it uses less digits than its factorization.

18542557211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272412.

The product of its digits is 112000, while the sum is 41.

The spelling of 18542557211 in words is "eighteen billion, five hundred forty-two million, five hundred fifty-seven thousand, two hundred eleven".