18623440133 has 2 divisors, whose sum is σ = 18623440134. Its totient is φ = 18623440132.

The previous prime is 18623440079. The next prime is 18623440153. The reversal of 18623440133 is 33104432681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14821114564 + 3802325569 = 121742^2 + 61663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18623440133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18623440093 and 18623440102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18623440153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9311720066 + 9311720067.

It is an arithmetic number, because the mean of its divisors is an integer number (9311720067).

Almost surely, 2^18623440133 is an apocalyptic number.

It is an amenable number.

18623440133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18623440133 is an equidigital number, since it uses as much as digits as its factorization.

18623440133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 18623440133 in words is "eighteen billion, six hundred twenty-three million, four hundred forty thousand, one hundred thirty-three".