16686619979 has 2 divisors, whose sum is σ = 16686619980. Its totient is φ = 16686619978.

The previous prime is 16686619927. The next prime is 16686619993. The reversal of 16686619979 is 97991668661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16686619979 - 2²⁰ = 16685571403 is a prime.

It is not a weakly prime, because it can be changed into another prime (16686679979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343309989 + 8343309990.

It is an arithmetic number, because the mean of its divisors is an integer number (8343309990).

Almost surely, 2^16686619979 is an apocalyptic number.

16686619979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16686619979 is an equidigital number, since it uses as much as digits as its factorization.

16686619979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52907904, while the sum is 68.

The spelling of 16686619979 in words is "sixteen billion, six hundred eighty-six million, six hundred nineteen thousand, nine hundred seventy-nine".