12646640871 has 12 divisors (see below), whose sum is σ = 18298497672. Its totient is φ = 8416727376.

The previous prime is 12646640869. The next prime is 12646640911. The reversal of 12646640871 is 17804664621.

It is not a de Polignac number, because 12646640871 - 2¹ = 12646640869 is a prime.

It is a super-3 number, since 3×12646640871³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646640471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1191636 + ... + 1202201.

It is an arithmetic number, because the mean of its divisors is an integer number (1524874806).

Almost surely, 2^12646640871 is an apocalyptic number.

12646640871 is a deficient number, since it is larger than the sum of its proper divisors (5651856801).

12646640871 is a wasteful number, since it uses less digits than its factorization.

12646640871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394430 (or 2394427 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 12646640871 in words is "twelve billion, six hundred forty-six million, six hundred forty thousand, eight hundred seventy-one".