6645365 has 4 divisors (see below), whose sum is σ = 7974444. Its totient is φ = 5316288.

The previous prime is 6645341. The next prime is 6645389. The reversal of 6645365 is 5635466.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6645341) and next prime (6645389).

It can be written as a sum of positive squares in 2 ways, for example, as 1800964 + 4844401 = 1342^2 + 2201^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645365 - 2¹⁴ = 6628981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664532 + ... + 664541.

It is an arithmetic number, because the mean of its divisors is an integer number (1993611).

Almost surely, 2^6645365 is an apocalyptic number.

It is an amenable number.

6645365 is a deficient number, since it is larger than the sum of its proper divisors (1329079).

6645365 is a wasteful number, since it uses less digits than its factorization.

6645365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329078.

The product of its digits is 64800, while the sum is 35.

The square root of 6645365 is about 2577.8605470428. The cubic root of 6645365 is about 188.0065355356.

The spelling of 6645365 in words is "six million, six hundred forty-five thousand, three hundred sixty-five".