11421286661 has 2 divisors, whose sum is σ = 11421286662. Its totient is φ = 11421286660.

The previous prime is 11421286619. The next prime is 11421286691. The reversal of 11421286661 is 16668212411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8047884100 + 3373402561 = 89710^2 + 58081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11421286661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11421286691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710643330 + 5710643331.

It is an arithmetic number, because the mean of its divisors is an integer number (5710643331).

Almost surely, 2^11421286661 is an apocalyptic number.

It is an amenable number.

11421286661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421286661 is an equidigital number, since it uses as much as digits as its factorization.

11421286661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The spelling of 11421286661 in words is "eleven billion, four hundred twenty-one million, two hundred eighty-six thousand, six hundred sixty-one".