6640173 has 6 divisors (see below), whose sum is σ = 9591374. Its totient is φ = 4426776.

The previous prime is 6640163. The next prime is 6640181. The reversal of 6640173 is 3710466.

6640173 is a `hidden beast` number, since 6 + 640 + 17 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3674889 + 2965284 = 1917^2 + 1722^2 .

It is not a de Polignac number, because 6640173 - 2⁴ = 6640157 is a prime.

It is a super-3 number, since 3×6640173³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 368890 + ... + 368907.

Almost surely, 2^6640173 is an apocalyptic number.

It is an amenable number.

6640173 is a deficient number, since it is larger than the sum of its proper divisors (2951201).

6640173 is a wasteful number, since it uses less digits than its factorization.

6640173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737803 (or 737800 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 6640173 is about 2576.8533136366. The cubic root of 6640173 is about 187.9575598330.

The spelling of 6640173 in words is "six million, six hundred forty thousand, one hundred seventy-three".