12640125026 has 4 divisors (see below), whose sum is σ = 18960187542. Its totient is φ = 6320062512.

The previous prime is 12640125023. The next prime is 12640125077. The reversal of 12640125026 is 62052104621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62052104621 = 13 ⋅4773238817.

It can be written as a sum of positive squares in only one way, i.e., 9915180625 + 2724944401 = 99575^2 + 52201^2 .

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 12640125026.

It is not an unprimeable number, because it can be changed into a prime (12640125023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3160031255 + ... + 3160031258.

Almost surely, 2^12640125026 is an apocalyptic number.

12640125026 is a deficient number, since it is larger than the sum of its proper divisors (6320062516).

12640125026 is an equidigital number, since it uses as much as digits as its factorization.

12640125026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320062515.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 12640125026 its reverse (62052104621), we get a palindrome (74692229647).

The spelling of 12640125026 in words is "twelve billion, six hundred forty million, one hundred twenty-five thousand, twenty-six".