6766561 has 4 divisors (see below), whose sum is σ = 7164612. Its totient is φ = 6368512.

The previous prime is 6766519. The next prime is 6766579. The reversal of 6766561 is 1656676.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5089536 + 1677025 = 2256^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 6766561 - 2⁹ = 6766049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6766561.

It is not an unprimeable number, because it can be changed into a prime (6766511) 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, 199000 + ... + 199033.

It is an arithmetic number, because the mean of its divisors is an integer number (1791153).

Almost surely, 2^6766561 is an apocalyptic number.

It is an amenable number.

6766561 is a deficient number, since it is larger than the sum of its proper divisors (398051).

6766561 is a wasteful number, since it uses less digits than its factorization.

6766561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398050.

The product of its digits is 45360, while the sum is 37.

The square root of 6766561 is about 2601.2614247707. The cubic root of 6766561 is about 189.1425909014.

It can be divided in two parts, 676 and 6561, that multiplied together give a square (4435236 = 2106²).

The spelling of 6766561 in words is "six million, seven hundred sixty-six thousand, five hundred sixty-one".