12540144605101 has 4 divisors (see below), whose sum is σ = 12540788071900. Its totient is φ = 12539501138304.

The previous prime is 12540144605069. The next prime is 12540144605237. The reversal of 12540144605101 is 10150644104521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89655929476 + 12450488675625 = 299426^2 + 3528525^2 .

It is a cyclic number.

It is not a de Polignac number, because 12540144605101 - 2⁵ = 12540144605069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540144005101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321704166 + ... + 321743143.

It is an arithmetic number, because the mean of its divisors is an integer number (3135197017975).

Almost surely, 2^{12540144605101} is an apocalyptic number.

It is an amenable number.

12540144605101 is a deficient number, since it is larger than the sum of its proper divisors (643466799).

12540144605101 is an equidigital number, since it uses as much as digits as its factorization.

12540144605101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643466798.

The product of its (nonzero) digits is 19200, while the sum is 34.

Adding to 12540144605101 its reverse (10150644104521), we get a palindrome (22690788709622).

The spelling of 12540144605101 in words is "twelve trillion, five hundred forty billion, one hundred forty-four million, six hundred five thousand, one hundred one".