12256561566757 has 4 divisors (see below), whose sum is σ = 12256595119980. Its totient is φ = 12256528013536.

The previous prime is 12256561566731. The next prime is 12256561566793. The reversal of 12256561566757 is 75766516565221.

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 3179513368161 + 9077048198596 = 1783119^2 + 3012814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12256561566757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256561566257) 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, 16222582 + ... + 16961287.

It is an arithmetic number, because the mean of its divisors is an integer number (3064148779995).

Almost surely, 2^{12256561566757} is an apocalyptic number.

It is an amenable number.

12256561566757 is a deficient number, since it is larger than the sum of its proper divisors (33553223).

12256561566757 is an equidigital number, since it uses as much as digits as its factorization.

12256561566757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33553222.

The product of its digits is 158760000, while the sum is 64.

The spelling of 12256561566757 in words is "twelve trillion, two hundred fifty-six billion, five hundred sixty-one million, five hundred sixty-six thousand, seven hundred fifty-seven".