6665221300 has 36 divisors (see below), whose sum is σ = 14525656236. Its totient is φ = 2654636800.

The previous prime is 6665221259. The next prime is 6665221301. The reversal of 6665221300 is 31225666.

It can be written as a sum of positive squares in 6 ways, for example, as 587771536 + 6077449764 = 24244^2 + 77958^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665221301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119731 + ... + 166330.

It is an arithmetic number, because the mean of its divisors is an integer number (403490451).

Almost surely, 2^6665221300 is an apocalyptic number.

It is an amenable number.

6665221300 is an abundant number, since it is smaller than the sum of its proper divisors (7860434936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6665221300 is a wasteful number, since it uses less digits than its factorization.

6665221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286308 (or 286301 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6665221300 is about 81640.8065859225. The cubic root of 6665221300 is about 1881.9360337205.

Adding to 6665221300 its reverse (31225666), we get a palindrome (6696446966).

The spelling of 6665221300 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, three hundred".