12961712644 has 12 divisors (see below), whose sum is σ = 22780350684. Its totient is φ = 6453041024.

The previous prime is 12961712641. The next prime is 12961712651. The reversal of 12961712644 is 44621716921.

It can be written as a sum of positive squares in 2 ways, for example, as 1271778244 + 11689934400 = 35662^2 + 108120^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12961712644.

It is not an unprimeable number, because it can be changed into a prime (12961712641) 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, 6952777 + ... + 6954640.

It is an arithmetic number, because the mean of its divisors is an integer number (1898362557).

Almost surely, 2^12961712644 is an apocalyptic number.

It is an amenable number.

12961712644 is a deficient number, since it is larger than the sum of its proper divisors (9818638040).

12961712644 is a wasteful number, since it uses less digits than its factorization.

12961712644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13907654 (or 13907652 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 12961712644 in words is "twelve billion, nine hundred sixty-one million, seven hundred twelve thousand, six hundred forty-four".