6640153 has 8 divisors (see below), whose sum is σ = 7249928. Its totient is φ = 6044544.

The previous prime is 6640129. The next prime is 6640157. The reversal of 6640153 is 3510466.

It can be written as a sum of positive squares in 4 ways, for example, as 127449 + 6512704 = 357^2 + 2552^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640153 - 2⁵ = 6640121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2550 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (906241).

Almost surely, 2^6640153 is an apocalyptic number.

It is an amenable number.

6640153 is a deficient number, since it is larger than the sum of its proper divisors (609775).

6640153 is a wasteful number, since it uses less digits than its factorization.

6640153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 6640153 is about 2576.8494329316. The cubic root of 6640153 is about 187.9573711254.

The spelling of 6640153 in words is "six million, six hundred forty thousand, one hundred fifty-three".