18530938453 has 2 divisors, whose sum is σ = 18530938454. Its totient is φ = 18530938452.

The previous prime is 18530938409. The next prime is 18530938463. The reversal of 18530938453 is 35483903581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13703745969 + 4827192484 = 117063^2 + 69478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18530938453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18530938397 and 18530938406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18530938463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265469226 + 9265469227.

It is an arithmetic number, because the mean of its divisors is an integer number (9265469227).

Almost surely, 2^18530938453 is an apocalyptic number.

It is an amenable number.

18530938453 is a deficient number, since it is larger than the sum of its proper divisors (1).

18530938453 is an equidigital number, since it uses as much as digits as its factorization.

18530938453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 18530938453 in words is "eighteen billion, five hundred thirty million, nine hundred thirty-eight thousand, four hundred fifty-three".