12861120641 has 4 divisors (see below), whose sum is σ = 12954997572. Its totient is φ = 12767243712.

The previous prime is 12861120637. The next prime is 12861120661. The reversal of 12861120641 is 14602116821.

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 3025440016 + 9835680625 = 55004^2 + 99175^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861120641 - 2² = 12861120637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12861120598 and 12861120607.

It is not an unprimeable number, because it can be changed into a prime (12861120631) 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, 46938260 + ... + 46938533.

It is an arithmetic number, because the mean of its divisors is an integer number (3238749393).

Almost surely, 2^12861120641 is an apocalyptic number.

It is an amenable number.

12861120641 is a deficient number, since it is larger than the sum of its proper divisors (93876931).

12861120641 is an equidigital number, since it uses as much as digits as its factorization.

12861120641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93876930.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 12861120641 in words is "twelve billion, eight hundred sixty-one million, one hundred twenty thousand, six hundred forty-one".