664562441 has 2 divisors, whose sum is σ = 664562442. Its totient is φ = 664562440.

The previous prime is 664562401. The next prime is 664562443. The reversal of 664562441 is 144265466.

664562441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432640000 + 231922441 = 20800^2 + 15229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664562441 is a prime.

Together with 664562443, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 664562395 and 664562404.

It is not a weakly prime, because it can be changed into another prime (664562443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332281220 + 332281221.

It is an arithmetic number, because the mean of its divisors is an integer number (332281221).

Almost surely, 2^664562441 is an apocalyptic number.

It is an amenable number.

664562441 is a deficient number, since it is larger than the sum of its proper divisors (1).

664562441 is an equidigital number, since it uses as much as digits as its factorization.

664562441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 38.

The square root of 664562441 is about 25779.1086153110. The cubic root of 664562441 is about 872.6603908168.

The spelling of 664562441 in words is "six hundred sixty-four million, five hundred sixty-two thousand, four hundred forty-one".