12684406956 has 24 divisors (see below), whose sum is σ = 31873638384. Its totient is φ = 3902894400.

The previous prime is 12684406951. The next prime is 12684406961. The reversal of 12684406956 is 65960448621.

It is an interprime number because it is at equal distance from previous prime (12684406951) and next prime (12684406961).

It is a junction number, because it is equal to n+sod(n) for n = 12684406899 and 12684406908.

It is not an unprimeable number, because it can be changed into a prime (12684406951) 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, 40654995 + ... + 40655306.

It is an arithmetic number, because the mean of its divisors is an integer number (1328068266).

Almost surely, 2^12684406956 is an apocalyptic number.

It is an amenable number.

12684406956 is an abundant number, since it is smaller than the sum of its proper divisors (19189231428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12684406956 is a wasteful number, since it uses less digits than its factorization.

12684406956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81310321 (or 81310319 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 12684406956 in words is "twelve billion, six hundred eighty-four million, four hundred six thousand, nine hundred fifty-six".