199789663 has 2 divisors, whose sum is σ = 199789664. Its totient is φ = 199789662.

The previous prime is 199789633. The next prime is 199789673. The reversal of 199789663 is 366987991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199789663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199789598 and 199789607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199789633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99894831 + 99894832.

It is an arithmetic number, because the mean of its divisors is an integer number (99894832).

Almost surely, 2^199789663 is an apocalyptic number.

199789663 is a deficient number, since it is larger than the sum of its proper divisors (1).

199789663 is an equidigital number, since it uses as much as digits as its factorization.

199789663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 58.

The square root of 199789663 is about 14134.6971315271. The cubic root of 199789663 is about 584.5984660257.

The spelling of 199789663 in words is "one hundred ninety-nine million, seven hundred eighty-nine thousand, six hundred sixty-three".