26661601 has 2 divisors, whose sum is σ = 26661602. Its totient is φ = 26661600.

The previous prime is 26661587. The next prime is 26661611. The reversal of 26661601 is 10616662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 4004001 = 4760^2 + 2001^2 .

It is a cyclic number.

It is not a de Polignac number, because 26661601 - 2¹⁷ = 26530529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26661601.

It is not a weakly prime, because it can be changed into another prime (26661611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13330800 + 13330801.

It is an arithmetic number, because the mean of its divisors is an integer number (13330801).

Almost surely, 2^26661601 is an apocalyptic number.

It is an amenable number.

26661601 is a deficient number, since it is larger than the sum of its proper divisors (1).

26661601 is an equidigital number, since it uses as much as digits as its factorization.

26661601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 26661601 is about 5163.4872905818. The cubic root of 26661601 is about 298.7413974869.

The spelling of 26661601 in words is "twenty-six million, six hundred sixty-one thousand, six hundred one".