26668181 has 2 divisors, whose sum is σ = 26668182. Its totient is φ = 26668180.

The previous prime is 26668171. The next prime is 26668183. The reversal of 26668181 is 18186662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26615281 + 52900 = 5159^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 26668181 - 2¹⁴ = 26651797 is a prime.

It is a super-2 number, since 2×26668181² = 1422383755697522, which contains 22 as substring.

Together with 26668183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26668183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13334090 + 13334091.

It is an arithmetic number, because the mean of its divisors is an integer number (13334091).

Almost surely, 2^26668181 is an apocalyptic number.

It is an amenable number.

26668181 is a deficient number, since it is larger than the sum of its proper divisors (1).

26668181 is an equidigital number, since it uses as much as digits as its factorization.

26668181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 26668181 is about 5164.1244175562. The cubic root of 26668181 is about 298.7659716139.

The spelling of 26668181 in words is "twenty-six million, six hundred sixty-eight thousand, one hundred eighty-one".