16643888579 has 2 divisors, whose sum is σ = 16643888580. Its totient is φ = 16643888578.

The previous prime is 16643888557. The next prime is 16643888581. The reversal of 16643888579 is 97588834661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16643888579 - 2⁸ = 16643888323 is a prime.

Together with 16643888581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16643888509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321944289 + 8321944290.

It is an arithmetic number, because the mean of its divisors is an integer number (8321944290).

Almost surely, 2^16643888579 is an apocalyptic number.

16643888579 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643888579 is an equidigital number, since it uses as much as digits as its factorization.

16643888579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69672960, while the sum is 65.

The spelling of 16643888579 in words is "sixteen billion, six hundred forty-three million, eight hundred eighty-eight thousand, five hundred seventy-nine".