12870565681 has 4 divisors (see below), whose sum is σ = 13144407552. Its totient is φ = 12596723812.

The previous prime is 12870565663. The next prime is 12870565753. The reversal of 12870565681 is 18656507821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18656507821 = 7 ⋅2665215403.

It is a cyclic number.

It is not a de Polignac number, because 12870565681 - 2²³ = 12862177073 is a prime.

It is a super-2 number, since 2×12870565681² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12870565601) 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, 136920865 + ... + 136920958.

It is an arithmetic number, because the mean of its divisors is an integer number (3286101888).

Almost surely, 2^12870565681 is an apocalyptic number.

It is an amenable number.

12870565681 is a deficient number, since it is larger than the sum of its proper divisors (273841871).

12870565681 is an equidigital number, since it uses as much as digits as its factorization.

12870565681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273841870.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 12870565681 in words is "twelve billion, eight hundred seventy million, five hundred sixty-five thousand, six hundred eighty-one".