6646506239 has 2 divisors, whose sum is σ = 6646506240. Its totient is φ = 6646506238.

The previous prime is 6646506233. The next prime is 6646506247. The reversal of 6646506239 is 9326056466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646506239 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 6646506193 and 6646506202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646506233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323253119 + 3323253120.

It is an arithmetic number, because the mean of its divisors is an integer number (3323253120).

Almost surely, 2^6646506239 is an apocalyptic number.

6646506239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646506239 is an equidigital number, since it uses as much as digits as its factorization.

6646506239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The square root of 6646506239 is about 81526.1077140323. The cubic root of 6646506239 is about 1880.1729732767.

The spelling of 6646506239 in words is "six billion, six hundred forty-six million, five hundred six thousand, two hundred thirty-nine".