199668648079 has 2 divisors, whose sum is σ = 199668648080. Its totient is φ = 199668648078.

The previous prime is 199668648001. The next prime is 199668648139. The reversal of 199668648079 is 970846866991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199668648079 - 2³³ = 191078713487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199668648679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99834324039 + 99834324040.

It is an arithmetic number, because the mean of its divisors is an integer number (99834324040).

Almost surely, 2^199668648079 is an apocalyptic number.

199668648079 is a deficient number, since it is larger than the sum of its proper divisors (1).

199668648079 is an equidigital number, since it uses as much as digits as its factorization.

199668648079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282175488, while the sum is 73.

The spelling of 199668648079 in words is "one hundred ninety-nine billion, six hundred sixty-eight million, six hundred forty-eight thousand, seventy-nine".