11656454021647 has 2 divisors, whose sum is σ = 11656454021648. Its totient is φ = 11656454021646.

The previous prime is 11656454021593. The next prime is 11656454021657. The reversal of 11656454021647 is 74612045465611.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74612045465611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11656454021647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11656454021594 and 11656454021603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11656454021657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828227010823 + 5828227010824.

It is an arithmetic number, because the mean of its divisors is an integer number (5828227010824).

Almost surely, 2^{11656454021647} is an apocalyptic number.

11656454021647 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656454021647 is an equidigital number, since it uses as much as digits as its factorization.

11656454021647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The spelling of 11656454021647 in words is "eleven trillion, six hundred fifty-six billion, four hundred fifty-four million, twenty-one thousand, six hundred forty-seven".