12638777515 has 24 divisors (see below), whose sum is σ = 18999837360. Its totient is φ = 7999927488.

The previous prime is 12638777513. The next prime is 12638777519. The reversal of 12638777515 is 51577783621.

12638777515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12638777515 - 2¹ = 12638777513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12638777513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1980925 + ... + 1987294.

It is an arithmetic number, because the mean of its divisors is an integer number (791659890).

Almost surely, 2^12638777515 is an apocalyptic number.

12638777515 is a deficient number, since it is larger than the sum of its proper divisors (6361059845).

12638777515 is a wasteful number, since it uses less digits than its factorization.

12638777515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968251 (or 3968244 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 52.

It can be divided in two parts, 1263 and 8777515, that added together give a palindrome (8778778).

The spelling of 12638777515 in words is "twelve billion, six hundred thirty-eight million, seven hundred seventy-seven thousand, five hundred fifteen".