6655661 has 2 divisors, whose sum is σ = 6655662. Its totient is φ = 6655660.

The previous prime is 6655651. The next prime is 6655667. The reversal of 6655661 is 1665566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 1771561 = 2210^2 + 1331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6655661 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6655667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327830 + 3327831.

It is an arithmetic number, because the mean of its divisors is an integer number (3327831).

Almost surely, 2^6655661 is an apocalyptic number.

It is an amenable number.

6655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655661 is an equidigital number, since it uses as much as digits as its factorization.

6655661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 6655661 is about 2579.8567789705. The cubic root of 6655661 is about 188.1035814440.

The spelling of 6655661 in words is "six million, six hundred fifty-five thousand, six hundred sixty-one".