6664655447 has 2 divisors, whose sum is σ = 6664655448. Its totient is φ = 6664655446.

The previous prime is 6664655429. The next prime is 6664655461. The reversal of 6664655447 is 7445564666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6664655447 - 2¹⁸ = 6664393303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664651447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332327723 + 3332327724.

It is an arithmetic number, because the mean of its divisors is an integer number (3332327724).

Almost surely, 2^6664655447 is an apocalyptic number.

6664655447 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664655447 is an equidigital number, since it uses as much as digits as its factorization.

6664655447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 53.

The square root of 6664655447 is about 81637.3410088790. The cubic root of 6664655447 is about 1881.8827757096.

The spelling of 6664655447 in words is "six billion, six hundred sixty-four million, six hundred fifty-five thousand, four hundred forty-seven".