6646147187 has 2 divisors, whose sum is σ = 6646147188. Its totient is φ = 6646147186.

The previous prime is 6646147141. The next prime is 6646147201. The reversal of 6646147187 is 7817416466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646147187 is a prime.

It is not a weakly prime, because it can be changed into another prime (6646147117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323073593 + 3323073594.

It is an arithmetic number, because the mean of its divisors is an integer number (3323073594).

Almost surely, 2^6646147187 is an apocalyptic number.

6646147187 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646147187 is an equidigital number, since it uses as much as digits as its factorization.

6646147187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 50.

The square root of 6646147187 is about 81523.9056166963. The cubic root of 6646147187 is about 1880.1391162898.

The spelling of 6646147187 in words is "six billion, six hundred forty-six million, one hundred forty-seven thousand, one hundred eighty-seven".