199861026674371 has 2 divisors, whose sum is σ = 199861026674372. Its totient is φ = 199861026674370.

The previous prime is 199861026674341. The next prime is 199861026674431. The reversal of 199861026674371 is 173476620168991.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (173476620168991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199861026674371 - 2⁹ = 199861026673859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199861026674371.

It is not a weakly prime, because it can be changed into another prime (199861026674341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99930513337185 + 99930513337186.

It is an arithmetic number, because the mean of its divisors is an integer number (99930513337186).

Almost surely, 2^{199861026674371} is an apocalyptic number.

199861026674371 is a deficient number, since it is larger than the sum of its proper divisors (1).

199861026674371 is an equidigital number, since it uses as much as digits as its factorization.

199861026674371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 199861026674371 in words is "one hundred ninety-nine trillion, eight hundred sixty-one billion, twenty-six million, six hundred seventy-four thousand, three hundred seventy-one".