1326661056651 has 16 divisors (see below), whose sum is σ = 2021647835648. Its totient is φ = 758066126400.

The previous prime is 1326661056649. The next prime is 1326661056653. The reversal of 1326661056651 is 1566501666231.

It is an interprime number because it is at equal distance from previous prime (1326661056649) and next prime (1326661056653).

It is not a de Polignac number, because 1326661056651 - 2¹ = 1326661056649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1326661056651.

It is not an unprimeable number, because it can be changed into a prime (1326661056653) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 441490 + ... + 1687671.

It is an arithmetic number, because the mean of its divisors is an integer number (126352989728).

Almost surely, 2^{1326661056651} is an apocalyptic number.

1326661056651 is a deficient number, since it is larger than the sum of its proper divisors (694986778997).

1326661056651 is a wasteful number, since it uses less digits than its factorization.

1326661056651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158842.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 1326661056651 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-one million, fifty-six thousand, six hundred fifty-one".