2666440225 has 24 divisors (see below), whose sum is σ = 3507652728. Its totient is φ = 2003788800.

The previous prime is 2666440223. The next prime is 2666440241. The reversal of 2666440225 is 5220446662.

It can be written as a sum of positive squares in 12 ways, for example, as 130713489 + 2535726736 = 11433^2 + 50356^2 .

It is not a de Polignac number, because 2666440225 - 2¹ = 2666440223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666440223) 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 23 ways as a sum of consecutive naturals, for example, 224127 + ... + 235723.

It is an arithmetic number, because the mean of its divisors is an integer number (146152197).

Almost surely, 2^2666440225 is an apocalyptic number.

2666440225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2666440225 is a deficient number, since it is larger than the sum of its proper divisors (841212503).

2666440225 is a wasteful number, since it uses less digits than its factorization.

2666440225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12165 (or 12160 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 2666440225 is about 51637.5853908759. The cubic root of 2666440225 is about 1386.6832961196.

Adding to 2666440225 its reverse (5220446662), we get a palindrome (7886886887).

The spelling of 2666440225 in words is "two billion, six hundred sixty-six million, four hundred forty thousand, two hundred twenty-five".