12642111245 has 4 divisors (see below), whose sum is σ = 15170533500. Its totient is φ = 10113688992.

The previous prime is 12642111199. The next prime is 12642111281. The reversal of 12642111245 is 54211124621.

It is a happy number.

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 9395618761 + 3246492484 = 96931^2 + 56978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642111245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264211120 + ... + 1264211129.

It is an arithmetic number, because the mean of its divisors is an integer number (3792633375).

Almost surely, 2^12642111245 is an apocalyptic number.

It is an amenable number.

12642111245 is a deficient number, since it is larger than the sum of its proper divisors (2528422255).

12642111245 is an equidigital number, since it uses as much as digits as its factorization.

12642111245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528422254.

The product of its digits is 3840, while the sum is 29.

Adding to 12642111245 its reverse (54211124621), we get a palindrome (66853235866).

The spelling of 12642111245 in words is "twelve billion, six hundred forty-two million, one hundred eleven thousand, two hundred forty-five".