26630561 has 2 divisors, whose sum is σ = 26630562. Its totient is φ = 26630560.

The previous prime is 26630543. The next prime is 26630563. The reversal of 26630561 is 16503662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 46225 = 5156^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 26630561 - 2¹⁴ = 26614177 is a prime.

Together with 26630563, 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 (26630563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13315280 + 13315281.

It is an arithmetic number, because the mean of its divisors is an integer number (13315281).

Almost surely, 2^26630561 is an apocalyptic number.

It is an amenable number.

26630561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26630561 is an equidigital number, since it uses as much as digits as its factorization.

26630561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 26630561 is about 5160.4806946640. The cubic root of 26630561 is about 298.6254187817.

The spelling of 26630561 in words is "twenty-six million, six hundred thirty thousand, five hundred sixty-one".