26664217 has 2 divisors, whose sum is σ = 26664218. Its totient is φ = 26664216.

The previous prime is 26664203. The next prime is 26664221. The reversal of 26664217 is 71246662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23921881 + 2742336 = 4891^2 + 1656^2 .

It is a cyclic number.

It is not a de Polignac number, because 26664217 - 2⁷ = 26664089 is a prime.

It is not a weakly prime, because it can be changed into another prime (26664017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332108 + 13332109.

It is an arithmetic number, because the mean of its divisors is an integer number (13332109).

Almost surely, 2^26664217 is an apocalyptic number.

It is an amenable number.

26664217 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664217 is an equidigital number, since it uses as much as digits as its factorization.

26664217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 26664217 is about 5163.7406015407. The cubic root of 26664217 is about 298.7511678671.

The spelling of 26664217 in words is "twenty-six million, six hundred sixty-four thousand, two hundred seventeen".