26640017 has 2 divisors, whose sum is σ = 26640018. Its totient is φ = 26640016.

The previous prime is 26640013. The next prime is 26640041. The reversal of 26640017 is 71004662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26635921 + 4096 = 5161^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640017 - 2² = 26640013 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26640013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320008 + 13320009.

It is an arithmetic number, because the mean of its divisors is an integer number (13320009).

Almost surely, 2^26640017 is an apocalyptic number.

It is an amenable number.

26640017 is a deficient number, since it is larger than the sum of its proper divisors (1).

26640017 is an equidigital number, since it uses as much as digits as its factorization.

26640017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 26640017 is about 5161.3968070669. The cubic root of 26640017 is about 298.6607599799.

Adding to 26640017 its reverse (71004662), we get a palindrome (97644679).

The spelling of 26640017 in words is "twenty-six million, six hundred forty thousand, seventeen".