12706728261 has 4 divisors (see below), whose sum is σ = 16942304352. Its totient is φ = 8471152172.

The previous prime is 12706728259. The next prime is 12706728277. The reversal of 12706728261 is 16282760721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12706728261 - 2¹ = 12706728259 is a prime.

It is a super-2 number, since 2×12706728261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12706728161) 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, 2117788041 + ... + 2117788046.

It is an arithmetic number, because the mean of its divisors is an integer number (4235576088).

Almost surely, 2^12706728261 is an apocalyptic number.

It is an amenable number.

12706728261 is a deficient number, since it is larger than the sum of its proper divisors (4235576091).

12706728261 is an equidigital number, since it uses as much as digits as its factorization.

12706728261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235576090.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 12706728261 in words is "twelve billion, seven hundred six million, seven hundred twenty-eight thousand, two hundred sixty-one".