12515051545 has 4 divisors (see below), whose sum is σ = 15018061860. Its totient is φ = 10012041232.

The previous prime is 12515051543. The next prime is 12515051561. The reversal of 12515051545 is 54515051521.

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 9992601369 + 2522450176 = 99963^2 + 50224^2 .

It is a cyclic number.

It is not a de Polignac number, because 12515051545 - 2¹ = 12515051543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12515051545.

It is not an unprimeable number, because it can be changed into a prime (12515051543) 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, 1251505150 + ... + 1251505159.

It is an arithmetic number, because the mean of its divisors is an integer number (3754515465).

Almost surely, 2^12515051545 is an apocalyptic number.

It is an amenable number.

12515051545 is a deficient number, since it is larger than the sum of its proper divisors (2503010315).

12515051545 is an equidigital number, since it uses as much as digits as its factorization.

12515051545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503010314.

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 12515051545 in words is "twelve billion, five hundred fifteen million, fifty-one thousand, five hundred forty-five".