6650007663221 has 16 divisors (see below), whose sum is σ = 7166972828400. Its totient is φ = 6133818908160.

The previous prime is 6650007663197. The next prime is 6650007663227. The reversal of 6650007663221 is 1223667000566.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 25715650321 + 6624292012900 = 160361^2 + 2573770^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650007663221 - 2¹⁰ = 6650007662197 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 (6650007663227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152918801 + ... + 152962281.

It is an arithmetic number, because the mean of its divisors is an integer number (447935801775).

Almost surely, 2^{6650007663221} is an apocalyptic number.

It is an amenable number.

6650007663221 is a deficient number, since it is larger than the sum of its proper divisors (516965165179).

6650007663221 is a wasteful number, since it uses less digits than its factorization.

6650007663221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52136.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 6650007663221 in words is "six trillion, six hundred fifty billion, seven million, six hundred sixty-three thousand, two hundred twenty-one".