6664651447 has 2 divisors, whose sum is σ = 6664651448. Its totient is φ = 6664651446.

The previous prime is 6664651397. The next prime is 6664651453. The reversal of 6664651447 is 7441564666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6664651447 - 2²³ = 6656262839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6664651447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664655447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332325723 + 3332325724.

It is an arithmetic number, because the mean of its divisors is an integer number (3332325724).

Almost surely, 2^6664651447 is an apocalyptic number.

6664651447 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664651447 is an equidigital number, since it uses as much as digits as its factorization.

6664651447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 49.

The square root of 6664651447 is about 81637.3165102822. The cubic root of 6664651447 is about 1881.8823992193.

The spelling of 6664651447 in words is "six billion, six hundred sixty-four million, six hundred fifty-one thousand, four hundred forty-seven".