6645632171 has 2 divisors, whose sum is σ = 6645632172. Its totient is φ = 6645632170.

The previous prime is 6645632107. The next prime is 6645632173. The reversal of 6645632171 is 1712365466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6645632171 - 2⁶ = 6645632107 is a prime.

Together with 6645632173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6645632173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322816085 + 3322816086.

It is an arithmetic number, because the mean of its divisors is an integer number (3322816086).

Almost surely, 2^6645632171 is an apocalyptic number.

6645632171 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645632171 is an equidigital number, since it uses as much as digits as its factorization.

6645632171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The square root of 6645632171 is about 81520.7468746454. The cubic root of 6645632171 is about 1880.0905504711.

The spelling of 6645632171 in words is "six billion, six hundred forty-five million, six hundred thirty-two thousand, one hundred seventy-one".