12515555555 has 4 divisors (see below), whose sum is σ = 15018666672. Its totient is φ = 10012444440.

The previous prime is 12515555543. The next prime is 12515555557. The reversal of 12515555555 is 55555551521.

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

It is not a de Polignac number, because 12515555555 - 2¹² = 12515551459 is a prime.

It is a Duffinian number.

12515555555 is a modest number, since divided by 555555 gives 12515 as remainder.

It is not an unprimeable number, because it can be changed into a prime (12515555557) 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, 1251555551 + ... + 1251555560.

It is an arithmetic number, because the mean of its divisors is an integer number (3754666668).

Almost surely, 2^12515555555 is an apocalyptic number.

12515555555 is a deficient number, since it is larger than the sum of its proper divisors (2503111117).

12515555555 is an equidigital number, since it uses as much as digits as its factorization.

12515555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503111116.

The product of its digits is 781250, while the sum is 44.

The spelling of 12515555555 in words is "twelve billion, five hundred fifteen million, five hundred fifty-five thousand, five hundred fifty-five".