18181825583 has 2 divisors, whose sum is σ = 18181825584. Its totient is φ = 18181825582.

The previous prime is 18181825573. The next prime is 18181825603. The reversal of 18181825583 is 38552818181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18181825583 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18181825523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090912791 + 9090912792.

It is an arithmetic number, because the mean of its divisors is an integer number (9090912792).

Almost surely, 2^18181825583 is an apocalyptic number.

18181825583 is a deficient number, since it is larger than the sum of its proper divisors (1).

18181825583 is an equidigital number, since it uses as much as digits as its factorization.

18181825583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 614400, while the sum is 50.

The spelling of 18181825583 in words is "eighteen billion, one hundred eighty-one million, eight hundred twenty-five thousand, five hundred eighty-three".