16663303817 has 2 divisors, whose sum is σ = 16663303818. Its totient is φ = 16663303816.

The previous prime is 16663303781. The next prime is 16663303841. The reversal of 16663303817 is 71830336661.

Together with previous prime (16663303781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15848543881 + 814759936 = 125891^2 + 28544^2 .

It is a cyclic number.

It is not a de Polignac number, because 16663303817 - 2¹⁸ = 16663041673 is a prime.

It is not a weakly prime, because it can be changed into another prime (16663300817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331651908 + 8331651909.

It is an arithmetic number, because the mean of its divisors is an integer number (8331651909).

Almost surely, 2^16663303817 is an apocalyptic number.

It is an amenable number.

16663303817 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663303817 is an equidigital number, since it uses as much as digits as its factorization.

16663303817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 16663303817 in words is "sixteen billion, six hundred sixty-three million, three hundred three thousand, eight hundred seventeen".