6440166 has 12 divisors (see below), whose sum is σ = 13953732. Its totient is φ = 2146716.

The previous prime is 6440149. The next prime is 6440171. The reversal of 6440166 is 6610446.

6440166 is a `hidden beast` number, since 644 + 0 + 16 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178876 + ... + 178911.

It is an arithmetic number, because the mean of its divisors is an integer number (1162811).

Almost surely, 2^6440166 is an apocalyptic number.

6440166 is an abundant number, since it is smaller than the sum of its proper divisors (7513566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440166 is a wasteful number, since it uses less digits than its factorization.

6440166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357795 (or 357792 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6440166 is about 2537.7482144610. The cubic root of 6440166 is about 186.0511479177.

The spelling of 6440166 in words is "six million, four hundred forty thousand, one hundred sixty-six".