660027221 has 4 divisors (see below), whose sum is σ = 754316832. Its totient is φ = 565737612.

The previous prime is 660027217. The next prime is 660027233. The reversal of 660027221 is 122720066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660027221 - 2² = 660027217 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 (660227221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47144795 + ... + 47144808.

It is an arithmetic number, because the mean of its divisors is an integer number (188579208).

Almost surely, 2^660027221 is an apocalyptic number.

It is an amenable number.

660027221 is a deficient number, since it is larger than the sum of its proper divisors (94289611).

660027221 is an equidigital number, since it uses as much as digits as its factorization.

660027221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94289610.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 660027221 is about 25690.9949398617. The cubic root of 660027221 is about 870.6707387520.

Adding to 660027221 its reverse (122720066), we get a palindrome (782747287).

The spelling of 660027221 in words is "six hundred sixty million, twenty-seven thousand, two hundred twenty-one".