16663402213 has 2 divisors, whose sum is σ = 16663402214. Its totient is φ = 16663402212.

The previous prime is 16663402187. The next prime is 16663402229. The reversal of 16663402213 is 31220436661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14519527009 + 2143875204 = 120497^2 + 46302^2 .

It is a cyclic number.

It is not a de Polignac number, because 16663402213 - 2⁹ = 16663401701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16663402313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331701106 + 8331701107.

It is an arithmetic number, because the mean of its divisors is an integer number (8331701107).

Almost surely, 2^16663402213 is an apocalyptic number.

It is an amenable number.

16663402213 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663402213 is an equidigital number, since it uses as much as digits as its factorization.

16663402213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 16663402213 its reverse (31220436661), we get a palindrome (47883838874).

The spelling of 16663402213 in words is "sixteen billion, six hundred sixty-three million, four hundred two thousand, two hundred thirteen".