198400364191 has 2 divisors, whose sum is σ = 198400364192. Its totient is φ = 198400364190.

The previous prime is 198400364119. The next prime is 198400364209. The reversal of 198400364191 is 191463004891.

Together with previous prime (198400364119) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198400364191 is a prime.

It is a super-2 number, since 2×198400364191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198400664191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99200182095 + 99200182096.

It is an arithmetic number, because the mean of its divisors is an integer number (99200182096).

Almost surely, 2^198400364191 is an apocalyptic number.

198400364191 is a deficient number, since it is larger than the sum of its proper divisors (1).

198400364191 is an equidigital number, since it uses as much as digits as its factorization.

198400364191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 198400364191 in words is "one hundred ninety-eight billion, four hundred million, three hundred sixty-four thousand, one hundred ninety-one".