13642726861 has 2 divisors, whose sum is σ = 13642726862. Its totient is φ = 13642726860.

The previous prime is 13642726859. The next prime is 13642726907. The reversal of 13642726861 is 16862724631.

It is an a-pointer prime, because the next prime (13642726907) can be obtained adding 13642726861 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13269657636 + 373069225 = 115194^2 + 19315^2 .

It is a cyclic number.

It is not a de Polignac number, because 13642726861 - 2¹ = 13642726859 is a prime.

It is a super-2 number, since 2×13642726861² (a number of 21 digits) contains 22 as substring.

Together with 13642726859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13642726841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821363430 + 6821363431.

It is an arithmetic number, because the mean of its divisors is an integer number (6821363431).

Almost surely, 2^13642726861 is an apocalyptic number.

It is an amenable number.

13642726861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13642726861 is an equidigital number, since it uses as much as digits as its factorization.

13642726861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 46.

The spelling of 13642726861 in words is "thirteen billion, six hundred forty-two million, seven hundred twenty-six thousand, eight hundred sixty-one".