26065561 has 2 divisors, whose sum is σ = 26065562. Its totient is φ = 26065560.

The previous prime is 26065553. The next prime is 26065583. The reversal of 26065561 is 16556062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 12559936 = 3675^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 26065561 - 2³ = 26065553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26065531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13032780 + 13032781.

It is an arithmetic number, because the mean of its divisors is an integer number (13032781).

Almost surely, 2^26065561 is an apocalyptic number.

It is an amenable number.

26065561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26065561 is an equidigital number, since it uses as much as digits as its factorization.

26065561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 26065561 is about 5105.4442509932. Note that the first 3 decimals coincide. The cubic root of 26065561 is about 296.4984032287.

The spelling of 26065561 in words is "twenty-six million, sixty-five thousand, five hundred sixty-one".