666225460 has 12 divisors (see below), whose sum is σ = 1399073508. Its totient is φ = 266490176.

The previous prime is 666225403. The next prime is 666225467. The reversal of 666225460 is 64522666.

It is a happy number.

666225460 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 2 ways, for example, as 378380304 + 287845156 = 19452^2 + 16966^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666225467) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16655617 + ... + 16655656.

It is an arithmetic number, because the mean of its divisors is an integer number (116589459).

Almost surely, 2^666225460 is an apocalyptic number.

It is an amenable number.

666225460 is an abundant number, since it is smaller than the sum of its proper divisors (732848048).

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

666225460 is a wasteful number, since it uses less digits than its factorization.

666225460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33311282 (or 33311280 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 666225460 is about 25811.3436302723. The cubic root of 666225460 is about 873.3877074447.

The spelling of 666225460 in words is "six hundred sixty-six million, two hundred twenty-five thousand, four hundred sixty".