26305661 has 6 divisors (see below), whose sum is σ = 26485662. Its totient is φ = 26126840.

The previous prime is 26305651. The next prime is 26305687. The reversal of 26305661 is 16650362.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 6280036 = 4475^2 + 2506^2 .

It is not a de Polignac number, because 26305661 - 2⁶ = 26305597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26305651) 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 in 5 ways as a sum of consecutive naturals, for example, 31631 + ... + 32451.

It is an arithmetic number, because the mean of its divisors is an integer number (4414277).

Almost surely, 2^26305661 is an apocalyptic number.

It is an amenable number.

26305661 is a deficient number, since it is larger than the sum of its proper divisors (180001).

26305661 is an frugal number, since it uses more digits than its factorization.

26305661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 26305661 is about 5128.9044639182. The cubic root of 26305661 is about 297.4060094298.

The spelling of 26305661 in words is "twenty-six million, three hundred five thousand, six hundred sixty-one".