663481361 has 2 divisors, whose sum is σ = 663481362. Its totient is φ = 663481360.

The previous prime is 663481327. The next prime is 663481397. The reversal of 663481361 is 163184366.

It is a happy number.

663481361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490401025 + 173080336 = 22145^2 + 13156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663481361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663481061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331740680 + 331740681.

It is an arithmetic number, because the mean of its divisors is an integer number (331740681).

Almost surely, 2^663481361 is an apocalyptic number.

It is an amenable number.

663481361 is a deficient number, since it is larger than the sum of its proper divisors (1).

663481361 is an equidigital number, since it uses as much as digits as its factorization.

663481361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 663481361 is about 25758.1319392537. The cubic root of 663481361 is about 872.1869325589.

The spelling of 663481361 in words is "six hundred sixty-three million, four hundred eighty-one thousand, three hundred sixty-one".