200211211661 has 2 divisors, whose sum is σ = 200211211662. Its totient is φ = 200211211660.

The previous prime is 200211211637. The next prime is 200211211703. The reversal of 200211211661 is 166112112002.

200211211661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199993206436 + 218005225 = 447206^2 + 14765^2 .

It is a cyclic number.

It is not a de Polignac number, because 200211211661 - 2³⁰ = 199137469837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200211211261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100105605830 + 100105605831.

It is an arithmetic number, because the mean of its divisors is an integer number (100105605831).

Almost surely, 2^200211211661 is an apocalyptic number.

It is an amenable number.

200211211661 is a deficient number, since it is larger than the sum of its proper divisors (1).

200211211661 is an equidigital number, since it uses as much as digits as its factorization.

200211211661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 200211211661 its reverse (166112112002), we get a palindrome (366323323663).

The spelling of 200211211661 in words is "two hundred billion, two hundred eleven million, two hundred eleven thousand, six hundred sixty-one".