126765243523 has 4 divisors (see below), whose sum is σ = 126814938448. Its totient is φ = 126715548600.

The previous prime is 126765243511. The next prime is 126765243529. The reversal of 126765243523 is 325342567621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325342567621 = 23 ⋅14145329027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126765243523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126765243529) 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, 24843636 + ... + 24848737.

It is an arithmetic number, because the mean of its divisors is an integer number (31703734612).

Almost surely, 2^126765243523 is an apocalyptic number.

126765243523 is a deficient number, since it is larger than the sum of its proper divisors (49694925).

126765243523 is an equidigital number, since it uses as much as digits as its factorization.

126765243523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49694924.

The product of its digits is 1814400, while the sum is 46.

The spelling of 126765243523 in words is "one hundred twenty-six billion, seven hundred sixty-five million, two hundred forty-three thousand, five hundred twenty-three".