26198657 has 2 divisors, whose sum is σ = 26198658. Its totient is φ = 26198656.

The previous prime is 26198617. The next prime is 26198659. The reversal of 26198657 is 75689162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25969216 + 229441 = 5096^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 26198657 - 2²⁴ = 9421441 is a prime.

Together with 26198659, 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 (26198659) 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, 13099328 + 13099329.

It is an arithmetic number, because the mean of its divisors is an integer number (13099329).

Almost surely, 2^26198657 is an apocalyptic number.

It is an amenable number.

26198657 is a deficient number, since it is larger than the sum of its proper divisors (1).

26198657 is an equidigital number, since it uses as much as digits as its factorization.

26198657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 26198657 is about 5118.4623667660. The cubic root of 26198657 is about 297.0022068635.

The spelling of 26198657 in words is "twenty-six million, one hundred ninety-eight thousand, six hundred fifty-seven".