12455521553 has 4 divisors (see below), whose sum is σ = 12510391920. Its totient is φ = 12400651188.

The previous prime is 12455521543. The next prime is 12455521577. The reversal of 12455521553 is 35512555421.

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.

It is a cyclic number.

It is not a de Polignac number, because 12455521553 - 2⁸ = 12455521297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12455521543) 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, 27434843 + ... + 27435296.

It is an arithmetic number, because the mean of its divisors is an integer number (3127597980).

Almost surely, 2^12455521553 is an apocalyptic number.

It is an amenable number.

12455521553 is a deficient number, since it is larger than the sum of its proper divisors (54870367).

12455521553 is an equidigital number, since it uses as much as digits as its factorization.

12455521553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54870366.

The product of its digits is 150000, while the sum is 38.

The spelling of 12455521553 in words is "twelve billion, four hundred fifty-five million, five hundred twenty-one thousand, five hundred fifty-three".