6645471166 has 4 divisors (see below), whose sum is σ = 9968206752. Its totient is φ = 3322735582.

The previous prime is 6645471143. The next prime is 6645471169. The reversal of 6645471166 is 6611745466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645471169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661367790 + ... + 1661367793.

It is an arithmetic number, because the mean of its divisors is an integer number (2492051688).

Almost surely, 2^6645471166 is an apocalyptic number.

6645471166 is a deficient number, since it is larger than the sum of its proper divisors (3322735586).

6645471166 is a wasteful number, since it uses less digits than its factorization.

6645471166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322735585.

The product of its digits is 725760, while the sum is 46.

The square root of 6645471166 is about 81519.7593593112. The cubic root of 6645471166 is about 1880.0753672441.

The spelling of 6645471166 in words is "six billion, six hundred forty-five million, four hundred seventy-one thousand, one hundred sixty-six".