665334220 has 24 divisors (see below), whose sum is σ = 1397751264. Its totient is φ = 266029056.

The previous prime is 665334217. The next prime is 665334223. The reversal of 665334220 is 22433566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665334217) and next prime (665334223).

It is not an unprimeable number, because it can be changed into a prime (665334223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64329 + ... + 73951.

It is an arithmetic number, because the mean of its divisors is an integer number (58239636).

Almost surely, 2^665334220 is an apocalyptic number.

It is an amenable number.

665334220 is an abundant number, since it is smaller than the sum of its proper divisors (732417044).

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

665334220 is a wasteful number, since it uses less digits than its factorization.

665334220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13089 (or 13087 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 665334220 is about 25794.0733502873. The cubic root of 665334220 is about 872.9980768743.

Adding to 665334220 its reverse (22433566), we get a palindrome (687767786).

The spelling of 665334220 in words is "six hundred sixty-five million, three hundred thirty-four thousand, two hundred twenty".