16813391503 has 2 divisors, whose sum is σ = 16813391504. Its totient is φ = 16813391502.

The previous prime is 16813391471. The next prime is 16813391513. The reversal of 16813391503 is 30519331861.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (30519331861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16813391503 - 2⁵ = 16813391471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16813391513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8406695751 + 8406695752.

It is an arithmetic number, because the mean of its divisors is an integer number (8406695752).

Almost surely, 2^16813391503 is an apocalyptic number.

16813391503 is a deficient number, since it is larger than the sum of its proper divisors (1).

16813391503 is an equidigital number, since it uses as much as digits as its factorization.

16813391503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 16813391503 in words is "sixteen billion, eight hundred thirteen million, three hundred ninety-one thousand, five hundred three".