26640659 has 2 divisors, whose sum is σ = 26640660. Its totient is φ = 26640658.

The previous prime is 26640643. The next prime is 26640661. The reversal of 26640659 is 95604662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26640659 - 2⁴ = 26640643 is a prime.

Together with 26640661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26640689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320329 + 13320330.

It is an arithmetic number, because the mean of its divisors is an integer number (13320330).

Almost surely, 2^26640659 is an apocalyptic number.

26640659 is a deficient number, since it is larger than the sum of its proper divisors (1).

26640659 is an equidigital number, since it uses as much as digits as its factorization.

26640659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 26640659 is about 5161.4589991591. The cubic root of 26640659 is about 298.6631591108.

The spelling of 26640659 in words is "twenty-six million, six hundred forty thousand, six hundred fifty-nine".