26666666666657 has 4 divisors (see below), whose sum is σ = 26667031402176. Its totient is φ = 26666301931140.

The previous prime is 26666666666599. The next prime is 26666666666671. The reversal of 26666666666657 is 75666666666662.

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 a de Polignac number, because none of the positive numbers 2^k-26666666666657 is a prime.

It is a super-2 number, since 2×26666666666657² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26666666660657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182258069 + ... + 182404322.

It is an arithmetic number, because the mean of its divisors is an integer number (6666757850544).

Almost surely, 2^{26666666666657} is an apocalyptic number.

It is an amenable number.

26666666666657 is a deficient number, since it is larger than the sum of its proper divisors (364735519).

26666666666657 is an equidigital number, since it uses as much as digits as its factorization.

26666666666657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364735518.

The product of its digits is 25395793920, while the sum is 80.

The spelling of 26666666666657 in words is "twenty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-seven".