196858243573891 has 2 divisors, whose sum is σ = 196858243573892. Its totient is φ = 196858243573890.

The previous prime is 196858243573883. The next prime is 196858243573951. The reversal of 196858243573891 is 198375342858691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 196858243573891 - 2³ = 196858243573883 is a prime.

It is not a weakly prime, because it can be changed into another prime (196858243573841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98429121786945 + 98429121786946.

It is an arithmetic number, because the mean of its divisors is an integer number (98429121786946).

Almost surely, 2^{196858243573891} is an apocalyptic number.

196858243573891 is a deficient number, since it is larger than the sum of its proper divisors (1).

196858243573891 is an equidigital number, since it uses as much as digits as its factorization.

196858243573891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3135283200, while the sum is 79.

The spelling of 196858243573891 in words is "one hundred ninety-six trillion, eight hundred fifty-eight billion, two hundred forty-three million, five hundred seventy-three thousand, eight hundred ninety-one".