11566987963 has 2 divisors, whose sum is σ = 11566987964. Its totient is φ = 11566987962.

The previous prime is 11566987931. The next prime is 11566987987. The reversal of 11566987963 is 36978966511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11566987963 - 2⁵ = 11566987931 is a prime.

It is not a weakly prime, because it can be changed into another prime (11566984963) 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, 5783493981 + 5783493982.

It is an arithmetic number, because the mean of its divisors is an integer number (5783493982).

Almost surely, 2^11566987963 is an apocalyptic number.

11566987963 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566987963 is an equidigital number, since it uses as much as digits as its factorization.

11566987963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 61.

The spelling of 11566987963 in words is "eleven billion, five hundred sixty-six million, nine hundred eighty-seven thousand, nine hundred sixty-three".