12826920766561 has 24 divisors (see below), whose sum is σ = 14557829441792. Its totient is φ = 11281571373600.

The previous prime is 12826920766537. The next prime is 12826920766579. The reversal of 12826920766561 is 16566702962821.

It is not a de Polignac number, because 12826920766561 - 2¹⁹ = 12826920242273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12826920766561.

It is not an unprimeable number, because it can be changed into a prime (12826920766061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13195555 + ... + 14134231.

Almost surely, 2^{12826920766561} is an apocalyptic number.

12826920766561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12826920766561 is a deficient number, since it is larger than the sum of its proper divisors (1730908675231).

12826920766561 is a wasteful number, since it uses less digits than its factorization.

12826920766561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942373 (or 942362 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 12826920766561 in words is "twelve trillion, eight hundred twenty-six billion, nine hundred twenty million, seven hundred sixty-six thousand, five hundred sixty-one".