664231441 has 2 divisors, whose sum is σ = 664231442. Its totient is φ = 664231440.

The previous prime is 664231423. The next prime is 664231471. The reversal of 664231441 is 144132466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661981441 + 2250000 = 25729^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 664231441 - 2¹³ = 664223249 is a prime.

It is not a weakly prime, because it can be changed into another prime (664231411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332115720 + 332115721.

It is an arithmetic number, because the mean of its divisors is an integer number (332115721).

Almost surely, 2^664231441 is an apocalyptic number.

It is an amenable number.

664231441 is a deficient number, since it is larger than the sum of its proper divisors (1).

664231441 is an equidigital number, since it uses as much as digits as its factorization.

664231441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 664231441 is about 25772.6878885381. The cubic root of 664231441 is about 872.5154841629.

It can be divided in two parts, 6642 and 31441, that added together give a palindrome (38083).

The spelling of 664231441 in words is "six hundred sixty-four million, two hundred thirty-one thousand, four hundred forty-one".