12506388749 has 2 divisors, whose sum is σ = 12506388750. Its totient is φ = 12506388748.

The previous prime is 12506388743. The next prime is 12506388757. The reversal of 12506388749 is 94788360521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9501375625 + 3005013124 = 97475^2 + 54818^2 .

It is a cyclic number.

It is not a de Polignac number, because 12506388749 - 2⁸ = 12506388493 is a prime.

It is a super-2 number, since 2×12506388749² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12506388749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12506388743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6253194374 + 6253194375.

It is an arithmetic number, because the mean of its divisors is an integer number (6253194375).

It is a 1-persistent number, because it is pandigital, but 2⋅12506388749 = 25012777498 is not.

Almost surely, 2^12506388749 is an apocalyptic number.

It is an amenable number.

12506388749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12506388749 is an equidigital number, since it uses as much as digits as its factorization.

12506388749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 12506388749 in words is "twelve billion, five hundred six million, three hundred eighty-eight thousand, seven hundred forty-nine".