6645253 has 4 divisors (see below), whose sum is σ = 6859648. Its totient is φ = 6430860.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645253 is 3525466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6645253 - 2²¹ = 4548101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 214363 = 6645253 / (6 + 6 + 4 + 5 + 2 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107151 + ... + 107212.

It is an arithmetic number, because the mean of its divisors is an integer number (1714912).

Almost surely, 2^6645253 is an apocalyptic number.

It is an amenable number.

6645253 is a deficient number, since it is larger than the sum of its proper divisors (214395).

6645253 is a wasteful number, since it uses less digits than its factorization.

6645253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214394.

The product of its digits is 21600, while the sum is 31.

The square root of 6645253 is about 2577.8388235109. The cubic root of 6645253 is about 188.0054793182.

The spelling of 6645253 in words is "six million, six hundred forty-five thousand, two hundred fifty-three".