663957181441 has 2 divisors, whose sum is σ = 663957181442. Its totient is φ = 663957181440.

The previous prime is 663957181439. The next prime is 663957181457. The reversal of 663957181441 is 144181759366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663206640625 + 750540816 = 814375^2 + 27396^2 .

It is a cyclic number.

It is not a de Polignac number, because 663957181441 - 2¹ = 663957181439 is a prime.

Together with 663957181439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (663957181411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331978590720 + 331978590721.

It is an arithmetic number, because the mean of its divisors is an integer number (331978590721).

Almost surely, 2^663957181441 is an apocalyptic number.

It is an amenable number.

663957181441 is a deficient number, since it is larger than the sum of its proper divisors (1).

663957181441 is an equidigital number, since it uses as much as digits as its factorization.

663957181441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The spelling of 663957181441 in words is "six hundred sixty-three billion, nine hundred fifty-seven million, one hundred eighty-one thousand, four hundred forty-one".