12691429632905 has 4 divisors (see below), whose sum is σ = 15229715559492. Its totient is φ = 10153143706320.

The previous prime is 12691429632859. The next prime is 12691429632953. The reversal of 12691429632905 is 50923692419621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5054547125824 + 7636882507081 = 2248232^2 + 2763491^2 .

It is not a de Polignac number, because 12691429632905 - 2¹² = 12691429628809 is a prime.

It is a super-2 number, since 2×12691429632905² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1269142963286 + ... + 1269142963295.

It is an arithmetic number, because the mean of its divisors is an integer number (3807428889873).

Almost surely, 2^{12691429632905} is an apocalyptic number.

It is an amenable number.

12691429632905 is a deficient number, since it is larger than the sum of its proper divisors (2538285926587).

12691429632905 is an equidigital number, since it uses as much as digits as its factorization.

12691429632905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538285926586.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 12691429632905 in words is "twelve trillion, six hundred ninety-one billion, four hundred twenty-nine million, six hundred thirty-two thousand, nine hundred five".