26666191 has 2 divisors, whose sum is σ = 26666192. Its totient is φ = 26666190.

The previous prime is 26666179. The next prime is 26666197. The reversal of 26666191 is 19166662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26666191 - 2⁹ = 26665679 is a prime.

It is a super-2 number, since 2×26666191² = 1422171484896962, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26666191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26666197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333095 + 13333096.

It is an arithmetic number, because the mean of its divisors is an integer number (13333096).

Almost surely, 2^26666191 is an apocalyptic number.

26666191 is a deficient number, since it is larger than the sum of its proper divisors (1).

26666191 is an equidigital number, since it uses as much as digits as its factorization.

26666191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 26666191 is about 5163.9317385109. The cubic root of 26666191 is about 298.7585400475.

The spelling of 26666191 in words is "twenty-six million, six hundred sixty-six thousand, one hundred ninety-one".