18650916503 has 2 divisors, whose sum is σ = 18650916504. Its totient is φ = 18650916502.

The previous prime is 18650916457. The next prime is 18650916521. The reversal of 18650916503 is 30561905681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18650916503 - 2³⁰ = 17577174679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18650916593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9325458251 + 9325458252.

It is an arithmetic number, because the mean of its divisors is an integer number (9325458252).

Almost surely, 2^18650916503 is an apocalyptic number.

18650916503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18650916503 is an equidigital number, since it uses as much as digits as its factorization.

18650916503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 18650916503 in words is "eighteen billion, six hundred fifty million, nine hundred sixteen thousand, five hundred three".