12811061687 has 4 divisors (see below), whose sum is σ = 12811723080. Its totient is φ = 12810400296.

The previous prime is 12811061639. The next prime is 12811061693. The reversal of 12811061687 is 78616011821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12811061687 - 2²⁴ = 12794284471 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 (12811061987) 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, 300737 + ... + 340682.

It is an arithmetic number, because the mean of its divisors is an integer number (3202930770).

Almost surely, 2^12811061687 is an apocalyptic number.

12811061687 is a deficient number, since it is larger than the sum of its proper divisors (661393).

12811061687 is an equidigital number, since it uses as much as digits as its factorization.

12811061687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661392.

The product of its (nonzero) digits is 32256, while the sum is 41.

The spelling of 12811061687 in words is "twelve billion, eight hundred eleven million, sixty-one thousand, six hundred eighty-seven".