11566651 has 2 divisors, whose sum is σ = 11566652. Its totient is φ = 11566650.

The previous prime is 11566619. The next prime is 11566663. The reversal of 11566651 is 15666511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11566651 - 2⁵ = 11566619 is a prime.

It is not a weakly prime, because it can be changed into another prime (11566601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783325 + 5783326.

It is an arithmetic number, because the mean of its divisors is an integer number (5783326).

Almost surely, 2^11566651 is an apocalyptic number.

11566651 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566651 is an equidigital number, since it uses as much as digits as its factorization.

11566651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 11566651 is about 3400.9779475910. The cubic root of 11566651 is about 226.1530993323.

It can be divided in two parts, 115 and 66651, that added together give a palindrome (66766).

The spelling of 11566651 in words is "eleven million, five hundred sixty-six thousand, six hundred fifty-one".