12729374665 has 32 divisors (see below), whose sum is σ = 18617437440. Its totient is φ = 8156104704.

The previous prime is 12729374641. The next prime is 12729374687. The reversal of 12729374665 is 56647392721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12729374665 - 2²⁹ = 12192503753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5749 + ... + 159661.

It is an arithmetic number, because the mean of its divisors is an integer number (581794920).

Almost surely, 2^12729374665 is an apocalyptic number.

It is an amenable number.

12729374665 is a deficient number, since it is larger than the sum of its proper divisors (5888062775).

12729374665 is a wasteful number, since it uses less digits than its factorization.

12729374665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154081.

The product of its digits is 3810240, while the sum is 52.

The spelling of 12729374665 in words is "twelve billion, seven hundred twenty-nine million, three hundred seventy-four thousand, six hundred sixty-five".