12558949505 has 4 divisors (see below), whose sum is σ = 15070739412. Its totient is φ = 10047159600.

The previous prime is 12558949453. The next prime is 12558949573. The reversal of 12558949505 is 50594985521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9940887616 + 2618061889 = 99704^2 + 51167^2 .

It is not a de Polignac number, because 12558949505 - 2³⁰ = 11485207681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255894946 + ... + 1255894955.

It is an arithmetic number, because the mean of its divisors is an integer number (3767684853).

Almost surely, 2^12558949505 is an apocalyptic number.

It is an amenable number.

12558949505 is a deficient number, since it is larger than the sum of its proper divisors (2511789907).

12558949505 is an equidigital number, since it uses as much as digits as its factorization.

12558949505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511789906.

The product of its (nonzero) digits is 3240000, while the sum is 53.

The spelling of 12558949505 in words is "twelve billion, five hundred fifty-eight million, nine hundred forty-nine thousand, five hundred five".