11556646650649 has 2 divisors, whose sum is σ = 11556646650650. Its totient is φ = 11556646650648.

The previous prime is 11556646650607. The next prime is 11556646650667. The reversal of 11556646650649 is 94605664665511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11556137922624 + 508728025 = 3399432^2 + 22555^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556646650649 - 2⁹ = 11556646650137 is a prime.

It is not a weakly prime, because it can be changed into another prime (11556646630649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778323325324 + 5778323325325.

It is an arithmetic number, because the mean of its divisors is an integer number (5778323325325).

Almost surely, 2^{11556646650649} is an apocalyptic number.

It is an amenable number.

11556646650649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11556646650649 is an equidigital number, since it uses as much as digits as its factorization.

11556646650649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968000, while the sum is 64.

The spelling of 11556646650649 in words is "eleven trillion, five hundred fifty-six billion, six hundred forty-six million, six hundred fifty thousand, six hundred forty-nine".