12515155426 has 4 divisors (see below), whose sum is σ = 18772733142. Its totient is φ = 6257577712.

The previous prime is 12515155423. The next prime is 12515155451. The reversal of 12515155426 is 62455151521.

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

It can be written as a sum of positive squares in only one way, i.e., 12466839025 + 48316401 = 111655^2 + 6951^2 .

It is not an unprimeable number, because it can be changed into a prime (12515155423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128788855 + ... + 3128788858.

Almost surely, 2^12515155426 is an apocalyptic number.

12515155426 is a deficient number, since it is larger than the sum of its proper divisors (6257577716).

12515155426 is an equidigital number, since it uses as much as digits as its factorization.

12515155426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6257577715.

The product of its digits is 60000, while the sum is 37.

The spelling of 12515155426 in words is "twelve billion, five hundred fifteen million, one hundred fifty-five thousand, four hundred twenty-six".