12640360266 has 12 divisors (see below), whose sum is σ = 27387447282. Its totient is φ = 4213453416.

The previous prime is 12640360259. The next prime is 12640360273. The reversal of 12640360266 is 66206304621.

12640360266 is a `hidden beast` number, since 1 + 2 + 6 + 40 + 3 + 602 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (12640360259) and next prime (12640360273).

It can be written as a sum of positive squares in only one way, i.e., 10801237041 + 1839123225 = 103929^2 + 42885^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12640360266.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 351121101 + ... + 351121136.

Almost surely, 2^12640360266 is an apocalyptic number.

12640360266 is an abundant number, since it is smaller than the sum of its proper divisors (14747087016).

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

12640360266 is a wasteful number, since it uses less digits than its factorization.

12640360266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702242245 (or 702242242 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

Adding to 12640360266 its reverse (66206304621), we get a palindrome (78846664887).

The spelling of 12640360266 in words is "twelve billion, six hundred forty million, three hundred sixty thousand, two hundred sixty-six".