195819597667 has 2 divisors, whose sum is σ = 195819597668. Its totient is φ = 195819597666.

The previous prime is 195819597653. The next prime is 195819597689. The reversal of 195819597667 is 766795918591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195819597667 - 2²³ = 195811209059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195819597667.

It is not a weakly prime, because it can be changed into another prime (195819597607) 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, 97909798833 + 97909798834.

It is an arithmetic number, because the mean of its divisors is an integer number (97909798834).

Almost surely, 2^195819597667 is an apocalyptic number.

195819597667 is a deficient number, since it is larger than the sum of its proper divisors (1).

195819597667 is an equidigital number, since it uses as much as digits as its factorization.

195819597667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 257191200, while the sum is 73.

The spelling of 195819597667 in words is "one hundred ninety-five billion, eight hundred nineteen million, five hundred ninety-seven thousand, six hundred sixty-seven".