26671565 has 4 divisors (see below), whose sum is σ = 32005884. Its totient is φ = 21337248.

The previous prime is 26671543. The next prime is 26671591. The reversal of 26671565 is 56517662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56517662 = 2 ⋅28258831.

It can be written as a sum of positive squares in 2 ways, for example, as 5262436 + 21409129 = 2294^2 + 4627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26671565 is a prime.

It is a super-2 number, since 2×26671565² = 1422744759098450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667152 + ... + 2667161.

It is an arithmetic number, because the mean of its divisors is an integer number (8001471).

Almost surely, 2^26671565 is an apocalyptic number.

It is an amenable number.

26671565 is a deficient number, since it is larger than the sum of its proper divisors (5334319).

26671565 is an equidigital number, since it uses as much as digits as its factorization.

26671565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334318.

The product of its digits is 75600, while the sum is 38.

The square root of 26671565 is about 5164.4520522510. The cubic root of 26671565 is about 298.7786081624.

The spelling of 26671565 in words is "twenty-six million, six hundred seventy-one thousand, five hundred sixty-five".