199547790691 has 2 divisors, whose sum is σ = 199547790692. Its totient is φ = 199547790690.

The previous prime is 199547790577. The next prime is 199547790697. The reversal of 199547790691 is 196097745991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199547790691 - 2⁹ = 199547790179 is a prime.

It is not a weakly prime, because it can be changed into another prime (199547790697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99773895345 + 99773895346.

It is an arithmetic number, because the mean of its divisors is an integer number (99773895346).

Almost surely, 2^199547790691 is an apocalyptic number.

199547790691 is a deficient number, since it is larger than the sum of its proper divisors (1).

199547790691 is an equidigital number, since it uses as much as digits as its factorization.

199547790691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38578680, while the sum is 67.

The spelling of 199547790691 in words is "one hundred ninety-nine billion, five hundred forty-seven million, seven hundred ninety thousand, six hundred ninety-one".