6664655461 has 2 divisors, whose sum is σ = 6664655462. Its totient is φ = 6664655460.

The previous prime is 6664655447. The next prime is 6664655483. The reversal of 6664655461 is 1645564666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6267888900 + 396766561 = 79170^2 + 19919^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664655461 - 2⁵ = 6664655429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664653461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332327730 + 3332327731.

It is an arithmetic number, because the mean of its divisors is an integer number (3332327731).

Almost surely, 2^6664655461 is an apocalyptic number.

It is an amenable number.

6664655461 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664655461 is an equidigital number, since it uses as much as digits as its factorization.

6664655461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 49.

The square root of 6664655461 is about 81637.3410946241. The cubic root of 6664655461 is about 1881.8827770273.

The spelling of 6664655461 in words is "six billion, six hundred sixty-four million, six hundred fifty-five thousand, four hundred sixty-one".