11656446647 has 2 divisors, whose sum is σ = 11656446648. Its totient is φ = 11656446646.

The previous prime is 11656446563. The next prime is 11656446649. The reversal of 11656446647 is 74664465611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11656446647 - 2²⁶ = 11589337783 is a prime.

Together with 11656446649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11656446595 and 11656446604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11656446649) 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, 5828223323 + 5828223324.

It is an arithmetic number, because the mean of its divisors is an integer number (5828223324).

Almost surely, 2^11656446647 is an apocalyptic number.

11656446647 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656446647 is an equidigital number, since it uses as much as digits as its factorization.

11656446647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 50.

The spelling of 11656446647 in words is "eleven billion, six hundred fifty-six million, four hundred forty-six thousand, six hundred forty-seven".