6645351 has 16 divisors (see below), whose sum is σ = 9439200. Its totient is φ = 4144128.

The previous prime is 6645341. The next prime is 6645389. The reversal of 6645351 is 1535466.

6645351 = 43² + 44² + ... + 271².

It is not a de Polignac number, because 6645351 - 2⁵ = 6645319 is a prime.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11395 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (589950).

Almost surely, 2^6645351 is an apocalyptic number.

6645351 is a deficient number, since it is larger than the sum of its proper divisors (2793849).

6645351 is a wasteful number, since it uses less digits than its factorization.

6645351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818.

The product of its digits is 10800, while the sum is 30.

The square root of 6645351 is about 2577.8578316114. The cubic root of 6645351 is about 188.0064035091.

It can be divided in two parts, 6645 and 351, that added together give a palindrome (6996).

The spelling of 6645351 in words is "six million, six hundred forty-five thousand, three hundred fifty-one".