26666661 has 16 divisors (see below), whose sum is σ = 40774784. Its totient is φ = 15185664.

The previous prime is 26666621. The next prime is 26666663. The reversal of 26666661 is 16666662.

It is not a de Polignac number, because 26666661 - 2⁷ = 26666533 is a prime.

It is a super-2 number, since 2×26666661² = 1422221617777842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26666663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4545 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (2548424).

Almost surely, 2^26666661 is an apocalyptic number.

26666661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26666661 is a deficient number, since it is larger than the sum of its proper divisors (14108123).

26666661 is a wasteful number, since it uses less digits than its factorization.

26666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380.

The product of its digits is 93312, while the sum is 39.

The square root of 26666661 is about 5163.9772462706. The cubic root of 26666661 is about 298.7602952750.

Subtracting from 26666661 its reverse (16666662), we obtain a palindrome (9999999).

The spelling of 26666661 in words is "twenty-six million, six hundred sixty-six thousand, six hundred sixty-one".