6656471 has 2 divisors, whose sum is σ = 6656472. Its totient is φ = 6656470.

The previous prime is 6656459. The next prime is 6656483. The reversal of 6656471 is 1746566.

It is a balanced prime because it is at equal distance from previous prime (6656459) and next prime (6656483).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656471 is a prime.

It is a super-3 number, since 3×6656471³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656071) 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 as a sum of consecutive naturals, namely, 3328235 + 3328236.

It is an arithmetic number, because the mean of its divisors is an integer number (3328236).

Almost surely, 2^6656471 is an apocalyptic number.

6656471 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656471 is an equidigital number, since it uses as much as digits as its factorization.

6656471 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6656471 is about 2580.0137596532. The cubic root of 6656471 is about 188.1112119268. Note that the first 3 decimals are identical.

The spelling of 6656471 in words is "six million, six hundred fifty-six thousand, four hundred seventy-one".