866240660225 has 12 divisors (see below), whose sum is σ = 1074578534700. Its totient is φ = 692708582400.

The previous prime is 866240660213. The next prime is 866240660261. The reversal of 866240660225 is 522066042668.

It can be written as a sum of positive squares in 6 ways, for example, as 400751036401 + 465489623824 = 633049^2 + 682268^2 .

It is not a de Polignac number, because 866240660225 - 2⁸ = 866240659969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866240660225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7036400 + ... + 7158449.

It is an arithmetic number, because the mean of its divisors is an integer number (89548211225).

Almost surely, 2^866240660225 is an apocalyptic number.

It is an amenable number.

866240660225 is a deficient number, since it is larger than the sum of its proper divisors (208337874475).

866240660225 is a wasteful number, since it uses less digits than its factorization.

866240660225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197300 (or 14197295 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 866240660225 in words is "eight hundred sixty-six billion, two hundred forty million, six hundred sixty thousand, two hundred twenty-five".