198756974447 has 2 divisors, whose sum is σ = 198756974448. Its totient is φ = 198756974446.

The previous prime is 198756974441. The next prime is 198756974539. The reversal of 198756974447 is 744479657891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198756974447 - 2¹⁸ = 198756712303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198756974441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99378487223 + 99378487224.

It is an arithmetic number, because the mean of its divisors is an integer number (99378487224).

Almost surely, 2^198756974447 is an apocalyptic number.

198756974447 is a deficient number, since it is larger than the sum of its proper divisors (1).

198756974447 is an equidigital number, since it uses as much as digits as its factorization.

198756974447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 426746880, while the sum is 71.

The spelling of 198756974447 in words is "one hundred ninety-eight billion, seven hundred fifty-six million, nine hundred seventy-four thousand, four hundred forty-seven".