664041461 has 2 divisors, whose sum is σ = 664041462. Its totient is φ = 664041460.

The previous prime is 664041419. The next prime is 664041463. The reversal of 664041461 is 164140466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664041361 + 100 = 25769^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 664041461 - 2¹⁰ = 664040437 is a prime.

Together with 664041463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664041463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332020730 + 332020731.

It is an arithmetic number, because the mean of its divisors is an integer number (332020731).

Almost surely, 2^664041461 is an apocalyptic number.

It is an amenable number.

664041461 is a deficient number, since it is larger than the sum of its proper divisors (1).

664041461 is an equidigital number, since it uses as much as digits as its factorization.

664041461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 664041461 is about 25769.0019403158. The cubic root of 664041461 is about 872.4322921271.

The spelling of 664041461 in words is "six hundred sixty-four million, forty-one thousand, four hundred sixty-one".