6507661 has 2 divisors, whose sum is σ = 6507662. Its totient is φ = 6507660.

The previous prime is 6507649. The next prime is 6507673. The reversal of 6507661 is 1667056.

It is a balanced prime because it is at equal distance from previous prime (6507649) and next prime (6507673).

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 656100 = 2419^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 6507661 - 2⁷ = 6507533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6507691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253830 + 3253831.

It is an arithmetic number, because the mean of its divisors is an integer number (3253831).

Almost surely, 2^6507661 is an apocalyptic number.

It is an amenable number.

6507661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6507661 is an equidigital number, since it uses as much as digits as its factorization.

6507661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 6507661 is about 2551.0117600670. The cubic root of 6507661 is about 186.6988489723.

The spelling of 6507661 in words is "six million, five hundred seven thousand, six hundred sixty-one".