6665555447 has 2 divisors, whose sum is σ = 6665555448. Its totient is φ = 6665555446.

The previous prime is 6665555417. The next prime is 6665555453. The reversal of 6665555447 is 7445555666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6665555447 - 2⁶ = 6665555383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665555417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332777723 + 3332777724.

It is an arithmetic number, because the mean of its divisors is an integer number (3332777724).

Almost surely, 2^6665555447 is an apocalyptic number.

6665555447 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665555447 is an equidigital number, since it uses as much as digits as its factorization.

6665555447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120000, while the sum is 53.

The square root of 6665555447 is about 81642.8530062491. The cubic root of 6665555447 is about 1881.9674821773.

The spelling of 6665555447 in words is "six billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred forty-seven".