26561811 has 4 divisors (see below), whose sum is σ = 35415752. Its totient is φ = 17707872.

The previous prime is 26561789. The next prime is 26561827. The reversal of 26561811 is 11816562.

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

It is not a de Polignac number, because 26561811 - 2⁷ = 26561683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26561111) 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, 4426966 + ... + 4426971.

It is an arithmetic number, because the mean of its divisors is an integer number (8853938).

Almost surely, 2^26561811 is an apocalyptic number.

26561811 is a deficient number, since it is larger than the sum of its proper divisors (8853941).

26561811 is an equidigital number, since it uses as much as digits as its factorization.

26561811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8853940.

The product of its digits is 2880, while the sum is 30.

The square root of 26561811 is about 5153.8151887704. The cubic root of 26561811 is about 298.3682181637.

It can be divided in two parts, 26561 and 811, that added together give a palindrome (27372).

The spelling of 26561811 in words is "twenty-six million, five hundred sixty-one thousand, eight hundred eleven".