6610364221 has 2 divisors, whose sum is σ = 6610364222. Its totient is φ = 6610364220.

The previous prime is 6610364219. The next prime is 6610364231. The reversal of 6610364221 is 1224630166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6594252025 + 16112196 = 81205^2 + 4014^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610364221 - 2¹ = 6610364219 is a prime.

Together with 6610364219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6610364231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305182110 + 3305182111.

It is an arithmetic number, because the mean of its divisors is an integer number (3305182111).

Almost surely, 2^6610364221 is an apocalyptic number.

It is an amenable number.

6610364221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6610364221 is an equidigital number, since it uses as much as digits as its factorization.

6610364221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 6610364221 is about 81304.1463948795. The cubic root of 6610364221 is about 1876.7588091383.

Adding to 6610364221 its reverse (1224630166), we get a palindrome (7834994387).

The spelling of 6610364221 in words is "six billion, six hundred ten million, three hundred sixty-four thousand, two hundred twenty-one".