6663706871 has 2 divisors, whose sum is σ = 6663706872. Its totient is φ = 6663706870.

The previous prime is 6663706813. The next prime is 6663706949. The reversal of 6663706871 is 1786073666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6663706871 - 2¹⁴ = 6663690487 is a prime.

It is a super-2 number, since 2×6663706871² = 88809978525225221282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6663706811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331853435 + 3331853436.

It is an arithmetic number, because the mean of its divisors is an integer number (3331853436).

Almost surely, 2^6663706871 is an apocalyptic number.

6663706871 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663706871 is an equidigital number, since it uses as much as digits as its factorization.

6663706871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 6663706871 is about 81631.5311077772. The cubic root of 6663706871 is about 1881.7934890966.

The spelling of 6663706871 in words is "six billion, six hundred sixty-three million, seven hundred six thousand, eight hundred seventy-one".