6661313 has 2 divisors, whose sum is σ = 6661314.
Its totient is φ = 6661312.
The previous prime is 6661307. The next prime is 6661327. The reversal of 6661313 is 3131666.
Adding to 6661313 its reverse (3131666), we get a palindrome (9792979).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 6589489 + 71824 = 2567^2 + 268^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-6661313 is a prime.
It is not a weakly prime, because it can be changed into another prime (6661013) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330656 + 3330657.
It is an arithmetic number, because the mean of its divisors is an integer number (3330657).
Almost surely, 26661313 is an apocalyptic number.
It is an amenable number.
6661313 is a deficient number, since it is larger than the sum of its proper divisors (1).
6661313 is an equidigital number, since it uses as much as digits as its factorization.
6661313 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1944, while the sum is 26.
The square root of 6661313 is about 2580.9519561588.
The cubic root of 6661313 is about 188.1568123521.
The spelling of 6661313 in words is "six million, six hundred sixty-one thousand, three hundred thirteen".