26664943 has 2 divisors, whose sum is σ = 26664944. Its totient is φ = 26664942.

The previous prime is 26664941. The next prime is 26664947. The reversal of 26664943 is 34946662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26664943 - 2¹ = 26664941 is a prime.

It is a super-2 number, since 2×26664943² = 1422038370386498, which contains 22 as substring.

Together with 26664941, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 26664896 and 26664905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26664941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332471 + 13332472.

It is an arithmetic number, because the mean of its divisors is an integer number (13332472).

Almost surely, 2^26664943 is an apocalyptic number.

26664943 is a deficient number, since it is larger than the sum of its proper divisors (1).

26664943 is an equidigital number, since it uses as much as digits as its factorization.

26664943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 40.

The square root of 26664943 is about 5163.8108989389. The cubic root of 26664943 is about 298.7538792585.

It can be divided in two parts, 26664 and 943, that multiplied together give a palindrome (25144152).

The spelling of 26664943 in words is "twenty-six million, six hundred sixty-four thousand, nine hundred forty-three".