664161241 has 2 divisors, whose sum is σ = 664161242. Its totient is φ = 664161240.

The previous prime is 664161221. The next prime is 664161293. The reversal of 664161241 is 142161466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407232400 + 256928841 = 20180^2 + 16029^2 .

It is a cyclic number.

It is not a de Polignac number, because 664161241 - 2⁹ = 664160729 is a prime.

It is a super-2 number, since 2×664161241² = 882220308093320162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664161221) 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, 332080620 + 332080621.

It is an arithmetic number, because the mean of its divisors is an integer number (332080621).

Almost surely, 2^664161241 is an apocalyptic number.

It is an amenable number.

664161241 is a deficient number, since it is larger than the sum of its proper divisors (1).

664161241 is an equidigital number, since it uses as much as digits as its factorization.

664161241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 664161241 is about 25771.3259457095. The cubic root of 664161241 is about 872.4847455071.

The spelling of 664161241 in words is "six hundred sixty-four million, one hundred sixty-one thousand, two hundred forty-one".