11705558621 has 2 divisors, whose sum is σ = 11705558622. Its totient is φ = 11705558620.

The previous prime is 11705558611. The next prime is 11705558647. The reversal of 11705558621 is 12685550711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8480568100 + 3224990521 = 92090^2 + 56789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11705558621 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 (11705558611) 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, 5852779310 + 5852779311.

It is an arithmetic number, because the mean of its divisors is an integer number (5852779311).

Almost surely, 2^11705558621 is an apocalyptic number.

It is an amenable number.

11705558621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11705558621 is an equidigital number, since it uses as much as digits as its factorization.

11705558621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 41.

The spelling of 11705558621 in words is "eleven billion, seven hundred five million, five hundred fifty-eight thousand, six hundred twenty-one".