6646351 has 4 divisors (see below), whose sum is σ = 6674400. Its totient is φ = 6618304.

The previous prime is 6646331. The next prime is 6646357. The reversal of 6646351 is 1536466.

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

It is a cyclic number.

It is not a de Polignac number, because 6646351 - 2⁵ = 6646319 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 (6646357) 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 3 ways as a sum of consecutive naturals, for example, 13666 + ... + 14143.

It is an arithmetic number, because the mean of its divisors is an integer number (1668600).

Almost surely, 2^6646351 is an apocalyptic number.

6646351 is a deficient number, since it is larger than the sum of its proper divisors (28049).

6646351 is a wasteful number, since it uses less digits than its factorization.

6646351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28048.

The product of its digits is 12960, while the sum is 31.

The square root of 6646351 is about 2578.0517838089. The cubic root of 6646351 is about 188.0158335088.

The spelling of 6646351 in words is "six million, six hundred forty-six thousand, three hundred fifty-one".