12729718656 has 48 divisors (see below), whose sum is σ = 36631094760. Its totient is φ = 4243239168.

The previous prime is 12729718649. The next prime is 12729718657. The reversal of 12729718656 is 65681792721.

12729718656 is a `hidden beast` number, since 127 + 297 + 186 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729718657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5523900 + ... + 5526203.

Almost surely, 2^12729718656 is an apocalyptic number.

12729718656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12729718656 is an abundant number, since it is smaller than the sum of its proper divisors (23901376104).

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

12729718656 is a wasteful number, since it uses less digits than its factorization.

12729718656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11050123 (or 11050108 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 12729718656 in words is "twelve billion, seven hundred twenty-nine million, seven hundred eighteen thousand, six hundred fifty-six".