11703211661 has 2 divisors, whose sum is σ = 11703211662. Its totient is φ = 11703211660.

The previous prime is 11703211603. The next prime is 11703211727. The reversal of 11703211661 is 16611230711.

It is a happy number.

11703211661 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., 5883810436 + 5819401225 = 76706^2 + 76285^2 .

It is a cyclic number.

It is not a de Polignac number, because 11703211661 - 2¹⁴ = 11703195277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11703711661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5851605830 + 5851605831.

It is an arithmetic number, because the mean of its divisors is an integer number (5851605831).

Almost surely, 2^11703211661 is an apocalyptic number.

It is an amenable number.

11703211661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11703211661 is an equidigital number, since it uses as much as digits as its factorization.

11703211661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The spelling of 11703211661 in words is "eleven billion, seven hundred three million, two hundred eleven thousand, six hundred sixty-one".