26665641 has 12 divisors (see below), whose sum is σ = 39558532. Its totient is φ = 17296416.

The previous prime is 26665631. The next prime is 26665643. The reversal of 26665641 is 14656662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18662400 + 8003241 = 4320^2 + 2829^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26665641 is a prime.

It is a super-2 number, since 2×26665641² = 1422112819881762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26665596 and 26665605.

It is not an unprimeable number, because it can be changed into a prime (26665643) 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 11 ways as a sum of consecutive naturals, for example, 39706 + ... + 40371.

Almost surely, 2^26665641 is an apocalyptic number.

It is an amenable number.

26665641 is a deficient number, since it is larger than the sum of its proper divisors (12892891).

26665641 is a wasteful number, since it uses less digits than its factorization.

26665641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80120 (or 80117 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 26665641 is about 5163.8784842403. The cubic root of 26665641 is about 298.7564860318.

The spelling of 26665641 in words is "twenty-six million, six hundred sixty-five thousand, six hundred forty-one".