12512638888889 has 4 divisors (see below), whose sum is σ = 12514650250020. Its totient is φ = 12510627527760.

The previous prime is 12512638888829. The next prime is 12512638888903. The reversal of 12512638888889 is 98888883621521.

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 6583740174400 + 5928898714489 = 2565880^2 + 2434933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12512638888889 is a prime.

It is a super-2 number, since 2×12512638888889² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12512638888829) 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, 1005671234 + ... + 1005683675.

It is an arithmetic number, because the mean of its divisors is an integer number (3128662562505).

Almost surely, 2^{12512638888889} is an apocalyptic number.

It is an amenable number.

12512638888889 is a deficient number, since it is larger than the sum of its proper divisors (2011361131).

12512638888889 is an equidigital number, since it uses as much as digits as its factorization.

12512638888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011361130.

The product of its digits is 849346560, while the sum is 77.

The spelling of 12512638888889 in words is "twelve trillion, five hundred twelve billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".