26616521 has 2 divisors, whose sum is σ = 26616522. Its totient is φ = 26616520.

The previous prime is 26616479. The next prime is 26616559. The reversal of 26616521 is 12561662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 10010896 = 4075^2 + 3164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26616521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1660628 and since 26616521 and 1660628 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (26616721) 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, 13308260 + 13308261.

It is an arithmetic number, because the mean of its divisors is an integer number (13308261).

Almost surely, 2^26616521 is an apocalyptic number.

It is an amenable number.

26616521 is a deficient number, since it is larger than the sum of its proper divisors (1).

26616521 is an equidigital number, since it uses as much as digits as its factorization.

26616521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 26616521 is about 5159.1201769294. The cubic root of 26616521 is about 298.5729297396.

The spelling of 26616521 in words is "twenty-six million, six hundred sixteen thousand, five hundred twenty-one".