12656540422461 has 16 divisors (see below), whose sum is σ = 18481519264320. Its totient is φ = 7656629406720.

The previous prime is 12656540422367. The next prime is 12656540422483. The reversal of 12656540422461 is 16422404565621.

It is not a de Polignac number, because 12656540422461 - 2¹¹ = 12656540420413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12656540422461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656540422261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2750223780 + ... + 2750228381.

It is an arithmetic number, because the mean of its divisors is an integer number (1155094954020).

Almost surely, 2^{12656540422461} is an apocalyptic number.

It is an amenable number.

12656540422461 is a deficient number, since it is larger than the sum of its proper divisors (5824978841859).

12656540422461 is a wasteful number, since it uses less digits than its factorization.

12656540422461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500452236.

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 12656540422461 in words is "twelve trillion, six hundred fifty-six billion, five hundred forty million, four hundred twenty-two thousand, four hundred sixty-one".