26664161 has 4 divisors (see below), whose sum is σ = 27384852. Its totient is φ = 25943472.

The previous prime is 26664151. The next prime is 26664193. The reversal of 26664161 is 16146662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21911761 + 4752400 = 4681^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 26664161 - 2⁶ = 26664097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26664151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360290 + ... + 360363.

It is an arithmetic number, because the mean of its divisors is an integer number (6846213).

Almost surely, 2^26664161 is an apocalyptic number.

It is an amenable number.

26664161 is a deficient number, since it is larger than the sum of its proper divisors (720691).

26664161 is an equidigital number, since it uses as much as digits as its factorization.

26664161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720690.

The product of its digits is 10368, while the sum is 32.

The square root of 26664161 is about 5163.7351791121. The cubic root of 26664161 is about 298.7509587220.

The spelling of 26664161 in words is "twenty-six million, six hundred sixty-four thousand, one hundred sixty-one".