12867556423681 has 4 divisors (see below), whose sum is σ = 12872880197892. Its totient is φ = 12862232649472.

The previous prime is 12867556423619. The next prime is 12867556423693. The reversal of 12867556423681 is 18632465576821.

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 9108378324081 + 3759178099600 = 3018009^2 + 1938860^2 .

It is a cyclic number.

It is not a de Polignac number, because 12867556423681 - 2¹¹ = 12867556421633 is a prime.

It is a super-2 number, since 2×12867556423681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12867556423081) 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, 2661883480 + ... + 2661888313.

It is an arithmetic number, because the mean of its divisors is an integer number (3218220049473).

Almost surely, 2^{12867556423681} is an apocalyptic number.

It is an amenable number.

12867556423681 is a deficient number, since it is larger than the sum of its proper divisors (5323774211).

12867556423681 is an equidigital number, since it uses as much as digits as its factorization.

12867556423681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323774210.

The product of its digits is 116121600, while the sum is 64.

The spelling of 12867556423681 in words is "twelve trillion, eight hundred sixty-seven billion, five hundred fifty-six million, four hundred twenty-three thousand, six hundred eighty-one".