6651643 has 8 divisors (see below), whose sum is σ = 6911280. Its totient is φ = 6394080.

The previous prime is 6651587. The next prime is 6651647. The reversal of 6651643 is 3461566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6651643 - 2²¹ = 4554491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9733 + ... + 10393.

It is an arithmetic number, because the mean of its divisors is an integer number (863910).

Almost surely, 2^6651643 is an apocalyptic number.

6651643 is a deficient number, since it is larger than the sum of its proper divisors (259637).

6651643 is a wasteful number, since it uses less digits than its factorization.

6651643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037.

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

The square root of 6651643 is about 2579.0779360074. The cubic root of 6651643 is about 188.0657213260.

The spelling of 6651643 in words is "six million, six hundred fifty-one thousand, six hundred forty-three".