12781600645 has 8 divisors (see below), whose sum is σ = 16732277280. Its totient is φ = 9295709520.

The previous prime is 12781600639. The next prime is 12781600649. The reversal of 12781600645 is 54600618721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12781600645 - 2⁵ = 12781600613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12781600598 and 12781600607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781600649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 116196315 + ... + 116196424.

It is an arithmetic number, because the mean of its divisors is an integer number (2091534660).

Almost surely, 2^12781600645 is an apocalyptic number.

It is an amenable number.

12781600645 is a deficient number, since it is larger than the sum of its proper divisors (3950676635).

12781600645 is a wasteful number, since it uses less digits than its factorization.

12781600645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232392755.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 12781600645 in words is "twelve billion, seven hundred eighty-one million, six hundred thousand, six hundred forty-five".