195866819 has 2 divisors, whose sum is σ = 195866820. Its totient is φ = 195866818.

The previous prime is 195866807. The next prime is 195866837. The reversal of 195866819 is 918668591.

195866819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195866819 - 2¹⁶ = 195801283 is a prime.

It is a super-2 number, since 2×195866819² = 76727621570357522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (195866119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97933409 + 97933410.

It is an arithmetic number, because the mean of its divisors is an integer number (97933410).

Almost surely, 2^195866819 is an apocalyptic number.

195866819 is a deficient number, since it is larger than the sum of its proper divisors (1).

195866819 is an equidigital number, since it uses as much as digits as its factorization.

195866819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 195866819 is about 13995.2427274414. The cubic root of 195866819 is about 580.7469755362.

The spelling of 195866819 in words is "one hundred ninety-five million, eight hundred sixty-six thousand, eight hundred nineteen".