12631440257 has 4 divisors (see below), whose sum is σ = 12747325140. Its totient is φ = 12515555376.

The previous prime is 12631440229. The next prime is 12631440277. The reversal of 12631440257 is 75204413621.

12631440257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75204413621 = 72227 ⋅1041223.

It can be written as a sum of positive squares in 2 ways, for example, as 11090406721 + 1541033536 = 105311^2 + 39256^2 .

It is a cyclic number.

It is not a de Polignac number, because 12631440257 - 2⁸ = 12631440001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12631440277) 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 3 ways as a sum of consecutive naturals, for example, 57942278 + ... + 57942495.

It is an arithmetic number, because the mean of its divisors is an integer number (3186831285).

Almost surely, 2^12631440257 is an apocalyptic number.

It is an amenable number.

12631440257 is a deficient number, since it is larger than the sum of its proper divisors (115884883).

12631440257 is a wasteful number, since it uses less digits than its factorization.

12631440257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115884882.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 12631440257 its reverse (75204413621), we get a palindrome (87835853878).

The spelling of 12631440257 in words is "twelve billion, six hundred thirty-one million, four hundred forty thousand, two hundred fifty-seven".