195780799 has 2 divisors, whose sum is σ = 195780800. Its totient is φ = 195780798.

The previous prime is 195780797. The next prime is 195780811. The reversal of 195780799 is 997087591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195780799 - 2¹ = 195780797 is a prime.

Together with 195780797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195780797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97890399 + 97890400.

It is an arithmetic number, because the mean of its divisors is an integer number (97890400).

Almost surely, 2^195780799 is an apocalyptic number.

195780799 is a deficient number, since it is larger than the sum of its proper divisors (1).

195780799 is an equidigital number, since it uses as much as digits as its factorization.

195780799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 55.

The square root of 195780799 is about 13992.1692028077. The cubic root of 195780799 is about 580.6619463822.

The spelling of 195780799 in words is "one hundred ninety-five million, seven hundred eighty thousand, seven hundred ninety-nine".