26766561 has 4 divisors (see below), whose sum is σ = 35688752. Its totient is φ = 17844372.

The previous prime is 26766559. The next prime is 26766569. The reversal of 26766561 is 16566762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26766561 - 2¹ = 26766559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26766569) 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, 4461091 + ... + 4461096.

It is an arithmetic number, because the mean of its divisors is an integer number (8922188).

Almost surely, 2^26766561 is an apocalyptic number.

It is an amenable number.

26766561 is a deficient number, since it is larger than the sum of its proper divisors (8922191).

26766561 is an equidigital number, since it uses as much as digits as its factorization.

26766561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922190.

The product of its digits is 90720, while the sum is 39.

The square root of 26766561 is about 5173.6409809727. The cubic root of 26766561 is about 299.1329073602.

The spelling of 26766561 in words is "twenty-six million, seven hundred sixty-six thousand, five hundred sixty-one".