18933336497 has 2 divisors, whose sum is σ = 18933336498. Its totient is φ = 18933336496.

The previous prime is 18933336463. The next prime is 18933336593. The reversal of 18933336497 is 79463333981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11722609441 + 7210727056 = 108271^2 + 84916^2 .

It is a cyclic number.

It is not a de Polignac number, because 18933336497 - 2²⁰ = 18932287921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18933396497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9466668248 + 9466668249.

It is an arithmetic number, because the mean of its divisors is an integer number (9466668249).

Almost surely, 2^18933336497 is an apocalyptic number.

It is an amenable number.

18933336497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18933336497 is an equidigital number, since it uses as much as digits as its factorization.

18933336497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 56.

The spelling of 18933336497 in words is "eighteen billion, nine hundred thirty-three million, three hundred thirty-six thousand, four hundred ninety-seven".