26666135415613 has 2 divisors, whose sum is σ = 26666135415614. Its totient is φ = 26666135415612.

The previous prime is 26666135415611. The next prime is 26666135415671. The reversal of 26666135415613 is 31651453166662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26593638237604 + 72497178009 = 5156902^2 + 269253^2 .

It is a cyclic number.

It is not a de Polignac number, because 26666135415613 - 2¹ = 26666135415611 is a prime.

It is a super-2 number, since 2×26666135415613² (a number of 28 digits) contains 22 as substring.

Together with 26666135415611, 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 (26666135415611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333067707806 + 13333067707807.

It is an arithmetic number, because the mean of its divisors is an integer number (13333067707807).

Almost surely, 2^{26666135415613} is an apocalyptic number.

It is an amenable number.

26666135415613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26666135415613 is an equidigital number, since it uses as much as digits as its factorization.

26666135415613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13996800, while the sum is 55.

The spelling of 26666135415613 in words is "twenty-six trillion, six hundred sixty-six billion, one hundred thirty-five million, four hundred fifteen thousand, six hundred thirteen".