6640169 has 16 divisors (see below), whose sum is σ = 7311360. Its totient is φ = 6011280.

The previous prime is 6640163. The next prime is 6640181. The reversal of 6640169 is 9610466.

It is a de Polignac number, because none of the positive numbers 2^k-6640169 is a prime.

It is a super-2 number, since 2×6640169² = 88183688697122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47702 + ... + 47840.

It is an arithmetic number, because the mean of its divisors is an integer number (456960).

Almost surely, 2^6640169 is an apocalyptic number.

It is an amenable number.

6640169 is a deficient number, since it is larger than the sum of its proper divisors (671191).

6640169 is a wasteful number, since it uses less digits than its factorization.

6640169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6640169 is about 2576.8525374961. The cubic root of 6640169 is about 187.9575220915.

The spelling of 6640169 in words is "six million, six hundred forty thousand, one hundred sixty-nine".