18819228543 has 4 divisors (see below), whose sum is σ = 25092304728. Its totient is φ = 12546152360.

The previous prime is 18819228541. The next prime is 18819228551. The reversal of 18819228543 is 34582291881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18819228543 - 2¹ = 18819228541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18819228541) 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, 3136538088 + ... + 3136538093.

It is an arithmetic number, because the mean of its divisors is an integer number (6273076182).

Almost surely, 2^18819228543 is an apocalyptic number.

18819228543 is a deficient number, since it is larger than the sum of its proper divisors (6273076185).

18819228543 is an equidigital number, since it uses as much as digits as its factorization.

18819228543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6273076184.

The product of its digits is 1105920, while the sum is 51.

The spelling of 18819228543 in words is "eighteen billion, eight hundred nineteen million, two hundred twenty-eight thousand, five hundred forty-three".