6655011666601 has 2 divisors, whose sum is σ = 6655011666602. Its totient is φ = 6655011666600.

The previous prime is 6655011666503. The next prime is 6655011666647. The reversal of 6655011666601 is 1066661105566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4162089614400 + 2492922052201 = 2040120^2 + 1578899^2 .

It is a cyclic number.

It is not a de Polignac number, because 6655011666601 - 2³⁹ = 6105255852713 is a prime.

It is not a weakly prime, because it can be changed into another prime (6655011666671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327505833300 + 3327505833301.

It is an arithmetic number, because the mean of its divisors is an integer number (3327505833301).

Almost surely, 2^{6655011666601} is an apocalyptic number.

It is an amenable number.

6655011666601 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655011666601 is an equidigital number, since it uses as much as digits as its factorization.

6655011666601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 6655011666601 in words is "six trillion, six hundred fifty-five billion, eleven million, six hundred sixty-six thousand, six hundred one".