6640117 has 6 divisors (see below), whose sum is σ = 7298774. Its totient is φ = 6036360.

The previous prime is 6640111. The next prime is 6640121. The reversal of 6640117 is 7110466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6625476 + 14641 = 2574^2 + 121^2 .

It is not a de Polignac number, because 6640117 - 2⁷ = 6639989 is a prime.

It is a Duffinian number.

6640117 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6640091 and 6640100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640111) 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 in 5 ways as a sum of consecutive naturals, for example, 27318 + ... + 27559.

Almost surely, 2^6640117 is an apocalyptic number.

It is an amenable number.

6640117 is a deficient number, since it is larger than the sum of its proper divisors (658657).

6640117 is a wasteful number, since it uses less digits than its factorization.

6640117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54899 (or 54888 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 6640117 is about 2576.8424476479. The cubic root of 6640117 is about 187.9570314506.

The spelling of 6640117 in words is "six million, six hundred forty thousand, one hundred seventeen".