6665221301 has 2 divisors, whose sum is σ = 6665221302. Its totient is φ = 6665221300.

The previous prime is 6665221259. The next prime is 6665221319. The reversal of 6665221301 is 1031225666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5118687025 + 1546534276 = 71545^2 + 39326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665221301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665227301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332610650 + 3332610651.

It is an arithmetic number, because the mean of its divisors is an integer number (3332610651).

Almost surely, 2^6665221301 is an apocalyptic number.

It is an amenable number.

6665221301 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665221301 is an equidigital number, since it uses as much as digits as its factorization.

6665221301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 6665221301 is about 81640.8065920468. The cubic root of 6665221301 is about 1881.9360338146.

Adding to 6665221301 its reverse (1031225666), we get a palindrome (7696446967).

The spelling of 6665221301 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, three hundred one".