18493008133 has 2 divisors, whose sum is σ = 18493008134. Its totient is φ = 18493008132.

The previous prime is 18493008103. The next prime is 18493008137. The reversal of 18493008133 is 33180039481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15103672609 + 3389335524 = 122897^2 + 58218^2 .

It is an emirp because it is prime and its reverse (33180039481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18493008133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18493008137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9246504066 + 9246504067.

It is an arithmetic number, because the mean of its divisors is an integer number (9246504067).

Almost surely, 2^18493008133 is an apocalyptic number.

It is an amenable number.

18493008133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18493008133 is an equidigital number, since it uses as much as digits as its factorization.

18493008133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 18493008133 in words is "eighteen billion, four hundred ninety-three million, eight thousand, one hundred thirty-three".