12651665462605 has 32 divisors (see below), whose sum is σ = 16902278759520. Its totient is φ = 9031272837120.

The previous prime is 12651665462593. The next prime is 12651665462651. The reversal of 12651665462605 is 50626456615621.

It can be written as a sum of positive squares in 16 ways, for example, as 10316410814889 + 2335254647716 = 3211917^2 + 1528154^2 .

It is not a de Polignac number, because 12651665462605 - 2²⁵ = 12651631908173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21486312 + ... + 22067281.

It is an arithmetic number, because the mean of its divisors is an integer number (528196211235).

Almost surely, 2^{12651665462605} is an apocalyptic number.

It is an amenable number.

12651665462605 is a deficient number, since it is larger than the sum of its proper divisors (4250613296915).

12651665462605 is a wasteful number, since it uses less digits than its factorization.

12651665462605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43553761.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 12651665462605 in words is "twelve trillion, six hundred fifty-one billion, six hundred sixty-five million, four hundred sixty-two thousand, six hundred five".