26605613 has 2 divisors, whose sum is σ = 26605614. Its totient is φ = 26605612.

The previous prime is 26605609. The next prime is 26605651. The reversal of 26605613 is 31650662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21883684 + 4721929 = 4678^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 26605613 - 2² = 26605609 is a prime.

It is a super-5 number, since 5×26605613⁵ (a number of 38 digits) contains 55555 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26605013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13302806 + 13302807.

It is an arithmetic number, because the mean of its divisors is an integer number (13302807).

Almost surely, 2^26605613 is an apocalyptic number.

It is an amenable number.

26605613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26605613 is an equidigital number, since it uses as much as digits as its factorization.

26605613 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 26605613 is about 5158.0629115977. The cubic root of 26605613 is about 298.5321370489.

The spelling of 26605613 in words is "twenty-six million, six hundred five thousand, six hundred thirteen".