6651647 has 2 divisors, whose sum is σ = 6651648. Its totient is φ = 6651646.

The previous prime is 6651587. The next prime is 6651649. The reversal of 6651647 is 7461566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6651647 - 2⁶ = 6651583 is a prime.

Together with 6651649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6651649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325823 + 3325824.

It is an arithmetic number, because the mean of its divisors is an integer number (3325824).

Almost surely, 2^6651647 is an apocalyptic number.

6651647 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651647 is an equidigital number, since it uses as much as digits as its factorization.

6651647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 6651647 is about 2579.0787114782. The cubic root of 6651647 is about 188.0657590241.

The spelling of 6651647 in words is "six million, six hundred fifty-one thousand, six hundred forty-seven".