664180241 has 2 divisors, whose sum is σ = 664180242. Its totient is φ = 664180240.

The previous prime is 664180201. The next prime is 664180271. The reversal of 664180241 is 142081466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660490000 + 3690241 = 25700^2 + 1921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664180241 is a prime.

It is a super-2 number, since 2×664180241² = 882270785069636162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664180198 and 664180207.

It is not a weakly prime, because it can be changed into another prime (664180201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332090120 + 332090121.

It is an arithmetic number, because the mean of its divisors is an integer number (332090121).

Almost surely, 2^664180241 is an apocalyptic number.

It is an amenable number.

664180241 is a deficient number, since it is larger than the sum of its proper divisors (1).

664180241 is an equidigital number, since it uses as much as digits as its factorization.

664180241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 664180241 is about 25771.6945698183. The cubic root of 664180241 is about 872.4930653001.

The spelling of 664180241 in words is "six hundred sixty-four million, one hundred eighty thousand, two hundred forty-one".