6645349 has 4 divisors (see below), whose sum is σ = 6799936. Its totient is φ = 6490764.

The previous prime is 6645341. The next prime is 6645389. The reversal of 6645349 is 9435466.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9435466 = 2 ⋅4717733.

It is not a de Polignac number, because 6645349 - 2³ = 6645341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645341) 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, 77229 + ... + 77314.

It is an arithmetic number, because the mean of its divisors is an integer number (1699984).

Almost surely, 2^6645349 is an apocalyptic number.

It is an amenable number.

6645349 is a deficient number, since it is larger than the sum of its proper divisors (154587).

6645349 is a wasteful number, since it uses less digits than its factorization.

6645349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154586.

The product of its digits is 77760, while the sum is 37.

The square root of 6645349 is about 2577.8574436923. The cubic root of 6645349 is about 188.0063846481.

The spelling of 6645349 in words is "six million, six hundred forty-five thousand, three hundred forty-nine".