12440436553 has 4 divisors (see below), whose sum is σ = 12496223488. Its totient is φ = 12384649620.

The previous prime is 12440436529. The next prime is 12440436557. The reversal of 12440436553 is 35563404421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35563404421 = 233 ⋅152632637.

It is a cyclic number.

It is not a de Polignac number, because 12440436553 - 2³³ = 3850501961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440436557) 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, 27893133 + ... + 27893578.

It is an arithmetic number, because the mean of its divisors is an integer number (3124055872).

Almost surely, 2^12440436553 is an apocalyptic number.

It is an amenable number.

12440436553 is a deficient number, since it is larger than the sum of its proper divisors (55786935).

12440436553 is an equidigital number, since it uses as much as digits as its factorization.

12440436553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55786934.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 12440436553 in words is "twelve billion, four hundred forty million, four hundred thirty-six thousand, five hundred fifty-three".