6765601221 has 20 divisors (see below), whose sum is σ = 10108960972. Its totient is φ = 4509364608.

The previous prime is 6765601211. The next prime is 6765601259. The reversal of 6765601221 is 1221065676.

It is a happy number.

6765601221 is a `hidden beast` number, since 6 + 76 + 560 + 1 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3179268225 + 3586332996 = 56385^2 + 59886^2 .

It is not a de Polignac number, because 6765601221 - 2⁵ = 6765601189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6765601211) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 534255 + ... + 546771.

Almost surely, 2^6765601221 is an apocalyptic number.

It is an amenable number.

6765601221 is a deficient number, since it is larger than the sum of its proper divisors (3343359751).

6765601221 is a wasteful number, since it uses less digits than its factorization.

6765601221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19202 (or 19193 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 6765601221 is about 82253.2748345013. The cubic root of 6765601221 is about 1891.3364772376.

Adding to 6765601221 its reverse (1221065676), we get a palindrome (7986666897).

The spelling of 6765601221 in words is "six billion, seven hundred sixty-five million, six hundred one thousand, two hundred twenty-one".