18233559523 has 2 divisors, whose sum is σ = 18233559524. Its totient is φ = 18233559522.

The previous prime is 18233559503. The next prime is 18233559581. The reversal of 18233559523 is 32595533281.

It is a weak prime.

It is an emirp because it is prime and its reverse (32595533281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18233559523 is a prime.

It is not a weakly prime, because it can be changed into another prime (18233559503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9116779761 + 9116779762.

It is an arithmetic number, because the mean of its divisors is an integer number (9116779762).

Almost surely, 2^18233559523 is an apocalyptic number.

18233559523 is a deficient number, since it is larger than the sum of its proper divisors (1).

18233559523 is an equidigital number, since it uses as much as digits as its factorization.

18233559523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 46.

The spelling of 18233559523 in words is "eighteen billion, two hundred thirty-three million, five hundred fifty-nine thousand, five hundred twenty-three".