6601225665 has 16 divisors (see below), whose sum is σ = 10563136128. Its totient is φ = 3520262016.

The previous prime is 6601225663. The next prime is 6601225669. The reversal of 6601225665 is 5665221066.

It is a happy number.

It is not a de Polignac number, because 6601225665 - 2¹ = 6601225663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6601225661) 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 in 15 ways as a sum of consecutive naturals, for example, 159397 + ... + 196493.

It is an arithmetic number, because the mean of its divisors is an integer number (660196008).

Almost surely, 2^6601225665 is an apocalyptic number.

It is an amenable number.

6601225665 is a deficient number, since it is larger than the sum of its proper divisors (3961910463).

6601225665 is a wasteful number, since it uses less digits than its factorization.

6601225665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48968.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 6601225665 is about 81247.9271427893. The cubic root of 6601225665 is about 1875.8935630675.

The spelling of 6601225665 in words is "six billion, six hundred one million, two hundred twenty-five thousand, six hundred sixty-five".