12440648653 has 4 divisors (see below), whose sum is σ = 12485561020. Its totient is φ = 12395736288.

The previous prime is 12440648629. The next prime is 12440648659. The reversal of 12440648653 is 35684604421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35684604421 = 10099 ⋅3533479.

It can be written as a sum of positive squares in 2 ways, for example, as 3590166724 + 8850481929 = 59918^2 + 94077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440648653 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 (12440648659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22455768 + ... + 22456321.

It is an arithmetic number, because the mean of its divisors is an integer number (3121390255).

Almost surely, 2^12440648653 is an apocalyptic number.

It is an amenable number.

12440648653 is a deficient number, since it is larger than the sum of its proper divisors (44912367).

12440648653 is an equidigital number, since it uses as much as digits as its factorization.

12440648653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44912366.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 12440648653 in words is "twelve billion, four hundred forty million, six hundred forty-eight thousand, six hundred fifty-three".