16655566651 has 2 divisors, whose sum is σ = 16655566652. Its totient is φ = 16655566650.

The previous prime is 16655566639. The next prime is 16655566661. The reversal of 16655566651 is 15666555661.

It is a strong prime.

It is an emirp because it is prime and its reverse (15666555661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16655566651 - 2⁵ = 16655566619 is a prime.

It is not a weakly prime, because it can be changed into another prime (16655566661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8327783325 + 8327783326.

It is an arithmetic number, because the mean of its divisors is an integer number (8327783326).

Almost surely, 2^16655566651 is an apocalyptic number.

16655566651 is a deficient number, since it is larger than the sum of its proper divisors (1).

16655566651 is an equidigital number, since it uses as much as digits as its factorization.

16655566651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860000, while the sum is 52.

The spelling of 16655566651 in words is "sixteen billion, six hundred fifty-five million, five hundred sixty-six thousand, six hundred fifty-one".