6646513 has 2 divisors, whose sum is σ = 6646514.
Its totient is φ = 6646512.
The previous prime is 6646511. The next prime is 6646543. The reversal of 6646513 is 3156466.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 6615184 + 31329 = 2572^2 + 177^2
It is a cyclic number.
It is not a de Polignac number, because 6646513 - 21 = 6646511 is a prime.
It is a super-2 number, since 2×66465132 = 88352270118338, which contains 22 as substring.
Together with 6646511, it forms a pair of twin primes.
6646513 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (6646511) 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, 3323256 + 3323257.
It is an arithmetic number, because the mean of its divisors is an integer number (3323257).
Almost surely, 26646513 is an apocalyptic number.
It is an amenable number.
6646513 is a deficient number, since it is larger than the sum of its proper divisors (1).
6646513 is an equidigital number, since it uses as much as digits as its factorization.
6646513 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 12960, while the sum is 31.
The square root of 6646513 is about 2578.0832026915.
The cubic root of 6646513 is about 188.0173610797.
The spelling of 6646513 in words is "six million, six hundred forty-six thousand, five hundred thirteen".