12666940639 has 8 divisors (see below), whose sum is σ = 13028996768. Its totient is φ = 12305921760.

The previous prime is 12666940633. The next prime is 12666940679. The reversal of 12666940639 is 93604966621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12666940639 - 2⁹ = 12666940127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666940633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234507 + ... + 283420.

It is an arithmetic number, because the mean of its divisors is an integer number (1628624596).

Almost surely, 2^12666940639 is an apocalyptic number.

12666940639 is a deficient number, since it is larger than the sum of its proper divisors (362056129).

12666940639 is an equidigital number, since it uses as much as digits as its factorization.

12666940639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518625.

The product of its (nonzero) digits is 2519424, while the sum is 52.

The spelling of 12666940639 in words is "twelve billion, six hundred sixty-six million, nine hundred forty thousand, six hundred thirty-nine".