199748504849 has 2 divisors, whose sum is σ = 199748504850. Its totient is φ = 199748504848.

The previous prime is 199748504831. The next prime is 199748504903. The reversal of 199748504849 is 948405847991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112850308624 + 86898196225 = 335932^2 + 294785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199748504849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199748506849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99874252424 + 99874252425.

It is an arithmetic number, because the mean of its divisors is an integer number (99874252425).

Almost surely, 2^199748504849 is an apocalyptic number.

It is an amenable number.

199748504849 is a deficient number, since it is larger than the sum of its proper divisors (1).

199748504849 is an equidigital number, since it uses as much as digits as its factorization.

199748504849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 199748504849 in words is "one hundred ninety-nine billion, seven hundred forty-eight million, five hundred four thousand, eight hundred forty-nine".