6655666603 has 2 divisors, whose sum is σ = 6655666604. Its totient is φ = 6655666602.

The previous prime is 6655666601. The next prime is 6655666621. The reversal of 6655666603 is 3066665566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6655666603 - 2¹ = 6655666601 is a prime.

Together with 6655666601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6655666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327833301 + 3327833302.

It is an arithmetic number, because the mean of its divisors is an integer number (3327833302).

Almost surely, 2^6655666603 is an apocalyptic number.

6655666603 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655666603 is an equidigital number, since it uses as much as digits as its factorization.

6655666603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The square root of 6655666603 is about 81582.2689253002. The cubic root of 6655666603 is about 1881.0363422832.

The spelling of 6655666603 in words is "six billion, six hundred fifty-five million, six hundred sixty-six thousand, six hundred three".