12640290869 has 8 divisors (see below), whose sum is σ = 12803470680. Its totient is φ = 12477782016.

The previous prime is 12640290847. The next prime is 12640290907. The reversal of 12640290869 is 96809204621.

12640290869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 244140625 + 12396150244 = 15625^2 + 111338^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12640290869 - 2⁸ = 12640290613 is a prime.

It is a super-2 number, since 2×12640290869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640290829) 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 7 ways as a sum of consecutive naturals, for example, 129764 + ... + 205229.

It is an arithmetic number, because the mean of its divisors is an integer number (1600433835).

Almost surely, 2^12640290869 is an apocalyptic number.

It is an amenable number.

12640290869 is a deficient number, since it is larger than the sum of its proper divisors (163179811).

12640290869 is an equidigital number, since it uses as much as digits as its factorization.

12640290869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335479.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 12640290869 in words is "twelve billion, six hundred forty million, two hundred ninety thousand, eight hundred sixty-nine".