12645820129 has 4 divisors (see below), whose sum is σ = 12657853360. Its totient is φ = 12633786900.

The previous prime is 12645820123. The next prime is 12645820133. The reversal of 12645820129 is 92102854621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12645820129 - 2⁷ = 12645820001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12645820091 and 12645820100.

It is not an unprimeable number, because it can be changed into a prime (12645820123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6015039 + ... + 6017140.

It is an arithmetic number, because the mean of its divisors is an integer number (3164463340).

Almost surely, 2^12645820129 is an apocalyptic number.

It is an amenable number.

12645820129 is a deficient number, since it is larger than the sum of its proper divisors (12033231).

12645820129 is a wasteful number, since it uses less digits than its factorization.

12645820129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12033230.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 12645820129 in words is "twelve billion, six hundred forty-five million, eight hundred twenty thousand, one hundred twenty-nine".