26640013 has 2 divisors, whose sum is σ = 26640014. Its totient is φ = 26640012.

The previous prime is 26640001. The next prime is 26640017. The reversal of 26640013 is 31004662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14235529 + 12404484 = 3773^2 + 3522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26640013 is a prime.

It is equal to p_1662016 and since 26640013 and 1662016 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26640017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320006 + 13320007.

It is an arithmetic number, because the mean of its divisors is an integer number (13320007).

Almost surely, 2^26640013 is an apocalyptic number.

It is an amenable number.

26640013 is a deficient number, since it is larger than the sum of its proper divisors (1).

26640013 is an equidigital number, since it uses as much as digits as its factorization.

26640013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 26640013 is about 5161.3964195748. The cubic root of 26640013 is about 298.6607450319.

Adding to 26640013 its reverse (31004662), we get a palindrome (57644675).

The spelling of 26640013 in words is "twenty-six million, six hundred forty thousand, thirteen".