26563657 has 2 divisors, whose sum is σ = 26563658. Its totient is φ = 26563656.

The previous prime is 26563651. The next prime is 26563661. The reversal of 26563657 is 75636562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25969216 + 594441 = 5096^2 + 771^2 .

It is a cyclic number.

It is not a de Polignac number, because 26563657 - 2⁷ = 26563529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26563651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13281828 + 13281829.

It is an arithmetic number, because the mean of its divisors is an integer number (13281829).

Almost surely, 2^26563657 is an apocalyptic number.

It is an amenable number.

26563657 is a deficient number, since it is larger than the sum of its proper divisors (1).

26563657 is an equidigital number, since it uses as much as digits as its factorization.

26563657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The square root of 26563657 is about 5153.9942762871. The cubic root of 26563657 is about 298.3751300289.

The spelling of 26563657 in words is "twenty-six million, five hundred sixty-three thousand, six hundred fifty-seven".