12660837639 has 4 divisors (see below), whose sum is σ = 16881116856. Its totient is φ = 8440558424.

The previous prime is 12660837619. The next prime is 12660837641. The reversal of 12660837639 is 93673806621.

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

It is a cyclic number.

It is not a de Polignac number, because 12660837639 - 2¹⁷ = 12660706567 is a prime.

It is a super-2 number, since 2×12660837639² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12660837591 and 12660837600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660837619) 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, 2110139604 + ... + 2110139609.

It is an arithmetic number, because the mean of its divisors is an integer number (4220279214).

Almost surely, 2^12660837639 is an apocalyptic number.

12660837639 is a deficient number, since it is larger than the sum of its proper divisors (4220279217).

12660837639 is an equidigital number, since it uses as much as digits as its factorization.

12660837639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220279216.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 12660837639 in words is "twelve billion, six hundred sixty million, eight hundred thirty-seven thousand, six hundred thirty-nine".