6561767 has 2 divisors, whose sum is σ = 6561768. Its totient is φ = 6561766.

The previous prime is 6561761. The next prime is 6561781. The reversal of 6561767 is 7671656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6561767 - 2¹² = 6557671 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6561767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280883 + 3280884.

It is an arithmetic number, because the mean of its divisors is an integer number (3280884).

Almost surely, 2^6561767 is an apocalyptic number.

6561767 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561767 is an equidigital number, since it uses as much as digits as its factorization.

6561767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 6561767 is about 2561.5946205440. The cubic root of 6561767 is about 187.2148388260.

The spelling of 6561767 in words is "six million, five hundred sixty-one thousand, seven hundred sixty-seven".