6665221332 has 144 divisors (see below), whose sum is σ = 21047330304. Its totient is φ = 1727784000.

The previous prime is 6665221319. The next prime is 6665221349. The reversal of 6665221332 is 2331225666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1580707 + ... + 1584917.

It is an arithmetic number, because the mean of its divisors is an integer number (146162016).

Almost surely, 2^6665221332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665221332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10523665152).

6665221332 is an abundant number, since it is smaller than the sum of its proper divisors (14382108972).

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

6665221332 is a wasteful number, since it uses less digits than its factorization.

6665221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810 (or 4805 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 6665221332 is about 81640.8067819029. The cubic root of 6665221332 is about 1881.9360367323.

Adding to 6665221332 its reverse (2331225666), we get a palindrome (8996446998).

The spelling of 6665221332 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, three hundred thirty-two".