6647004869 has 2 divisors, whose sum is σ = 6647004870. Its totient is φ = 6647004868.

The previous prime is 6647004863. The next prime is 6647004883. The reversal of 6647004869 is 9684007466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4954752100 + 1692252769 = 70390^2 + 41137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6647004869 is a prime.

It is a super-2 number, since 2×6647004869² = 88365347457019414322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647004863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323502434 + 3323502435.

It is an arithmetic number, because the mean of its divisors is an integer number (3323502435).

Almost surely, 2^6647004869 is an apocalyptic number.

It is an amenable number.

6647004869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647004869 is an equidigital number, since it uses as much as digits as its factorization.

6647004869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The square root of 6647004869 is about 81529.1657568014. The cubic root of 6647004869 is about 1880.2199898180.

The spelling of 6647004869 in words is "six billion, six hundred forty-seven million, four thousand, eight hundred sixty-nine".