12505555660445 has 8 divisors (see below), whose sum is σ = 15006689800920. Its totient is φ = 10004429189440.

The previous prime is 12505555660439. The next prime is 12505555660463. The reversal of 12505555660445 is 54406655550521.

It can be written as a sum of positive squares in 4 ways, for example, as 4145841665956 + 8359713994489 = 2036134^2 + 2891317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12505555660445 - 2⁸ = 12505555660189 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2665835 + ... + 5667255.

It is an arithmetic number, because the mean of its divisors is an integer number (1875836225115).

Almost surely, 2^{12505555660445} is an apocalyptic number.

It is an amenable number.

12505555660445 is a deficient number, since it is larger than the sum of its proper divisors (2501134140475).

12505555660445 is an equidigital number, since it uses as much as digits as its factorization.

12505555660445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834735.

The product of its (nonzero) digits is 18000000, while the sum is 53.

The spelling of 12505555660445 in words is "twelve trillion, five hundred five billion, five hundred fifty-five million, six hundred sixty thousand, four hundred forty-five".