198756974399 has 2 divisors, whose sum is σ = 198756974400. Its totient is φ = 198756974398.

The previous prime is 198756974371. The next prime is 198756974413. The reversal of 198756974399 is 993479657891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198756974399 is a prime.

It is a super-2 number, since 2×198756974399² (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 (198756974309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99378487199 + 99378487200.

It is an arithmetic number, because the mean of its divisors is an integer number (99378487200).

Almost surely, 2^198756974399 is an apocalyptic number.

198756974399 is a deficient number, since it is larger than the sum of its proper divisors (1).

198756974399 is an equidigital number, since it uses as much as digits as its factorization.

198756974399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 925888320, while the sum is 77.

The spelling of 198756974399 in words is "one hundred ninety-eight billion, seven hundred fifty-six million, nine hundred seventy-four thousand, three hundred ninety-nine".