199711565849 has 2 divisors, whose sum is σ = 199711565850. Its totient is φ = 199711565848.

The previous prime is 199711565827. The next prime is 199711565861. The reversal of 199711565849 is 948565117991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117782808025 + 81928757824 = 343195^2 + 286232^2 .

It is a cyclic number.

It is not a de Polignac number, because 199711565849 - 2⁸ = 199711565593 is a prime.

It is not a weakly prime, because it can be changed into another prime (199711565869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99855782924 + 99855782925.

It is an arithmetic number, because the mean of its divisors is an integer number (99855782925).

Almost surely, 2^199711565849 is an apocalyptic number.

It is an amenable number.

199711565849 is a deficient number, since it is larger than the sum of its proper divisors (1).

199711565849 is an equidigital number, since it uses as much as digits as its factorization.

199711565849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 65.

The spelling of 199711565849 in words is "one hundred ninety-nine billion, seven hundred eleven million, five hundred sixty-five thousand, eight hundred forty-nine".