11566660591 has 2 divisors, whose sum is σ = 11566660592. Its totient is φ = 11566660590.

The previous prime is 11566660543. The next prime is 11566660627. The reversal of 11566660591 is 19506666511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11566660591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11566664591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783330295 + 5783330296.

It is an arithmetic number, because the mean of its divisors is an integer number (5783330296).

Almost surely, 2^11566660591 is an apocalyptic number.

11566660591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566660591 is an equidigital number, since it uses as much as digits as its factorization.

11566660591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 11566660591 in words is "eleven billion, five hundred sixty-six million, six hundred sixty thousand, five hundred ninety-one".