12655555505 has 4 divisors (see below), whose sum is σ = 15186666612. Its totient is φ = 10124444400.

The previous prime is 12655555501. The next prime is 12655555573. The reversal of 12655555505 is 50555555621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50555555621 = 17 ⋅2973856213.

It can be written as a sum of positive squares in 2 ways, for example, as 2452131361 + 10203424144 = 49519^2 + 101012^2 .

It is not a de Polignac number, because 12655555505 - 2² = 12655555501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12655555501) 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, 1265555546 + ... + 1265555555.

It is an arithmetic number, because the mean of its divisors is an integer number (3796666653).

Almost surely, 2^12655555505 is an apocalyptic number.

It is an amenable number.

12655555505 is a deficient number, since it is larger than the sum of its proper divisors (2531111107).

12655555505 is an equidigital number, since it uses as much as digits as its factorization.

12655555505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531111106.

The product of its (nonzero) digits is 937500, while the sum is 44.

The spelling of 12655555505 in words is "twelve billion, six hundred fifty-five million, five hundred fifty-five thousand, five hundred five".