12668278671 has 24 divisors (see below), whose sum is σ = 20394756720. Its totient is φ = 7530368256.

The previous prime is 12668278669. The next prime is 12668278673. The reversal of 12668278671 is 17687286621.

It is an interprime number because it is at equal distance from previous prime (12668278669) and next prime (12668278673).

It is not a de Polignac number, because 12668278671 - 2¹ = 12668278669 is a prime.

It is a super-2 number, since 2×12668278671² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12668278673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2176020 + ... + 2181833.

It is an arithmetic number, because the mean of its divisors is an integer number (849781530).

Almost surely, 2^12668278671 is an apocalyptic number.

12668278671 is a deficient number, since it is larger than the sum of its proper divisors (7726478049).

12668278671 is a wasteful number, since it uses less digits than its factorization.

12668278671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357895 (or 4357892 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 12668278671 in words is "twelve billion, six hundred sixty-eight million, two hundred seventy-eight thousand, six hundred seventy-one".