12137126257 has 4 divisors (see below), whose sum is σ = 12144671140. Its totient is φ = 12129581376.

The previous prime is 12137126249. The next prime is 12137126273. The reversal of 12137126257 is 75262173121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75262173121 = 29 ⋅2595247349.

It can be written as a sum of positive squares in 2 ways, for example, as 11773118016 + 364008241 = 108504^2 + 19079^2 .

It is a cyclic number.

It is not a de Polignac number, because 12137126257 - 2³ = 12137126249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12137124257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3770028 + ... + 3773245.

It is an arithmetic number, because the mean of its divisors is an integer number (3036167785).

Almost surely, 2^12137126257 is an apocalyptic number.

It is an amenable number.

12137126257 is a deficient number, since it is larger than the sum of its proper divisors (7544883).

12137126257 is an equidigital number, since it uses as much as digits as its factorization.

12137126257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7544882.

The product of its digits is 35280, while the sum is 37.

Adding to 12137126257 its reverse (75262173121), we get a palindrome (87399299378).

The spelling of 12137126257 in words is "twelve billion, one hundred thirty-seven million, one hundred twenty-six thousand, two hundred fifty-seven".