665622260 has 24 divisors (see below), whose sum is σ = 1405057416. Its totient is φ = 264867840.

The previous prime is 665622253. The next prime is 665622271. The reversal of 665622260 is 62226566.

It can be written as a sum of positive squares in 4 ways, for example, as 48497296 + 617124964 = 6964^2 + 24842^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665622260.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82361 + ... + 90080.

It is an arithmetic number, because the mean of its divisors is an integer number (58544059).

Almost surely, 2^665622260 is an apocalyptic number.

It is an amenable number.

665622260 is an abundant number, since it is smaller than the sum of its proper divisors (739435156).

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

665622260 is a wasteful number, since it uses less digits than its factorization.

665622260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172643 (or 172641 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 665622260 is about 25799.6561992597. The cubic root of 665622260 is about 873.1240396759.

The spelling of 665622260 in words is "six hundred sixty-five million, six hundred twenty-two thousand, two hundred sixty".