663385649 has 2 divisors, whose sum is σ = 663385650. Its totient is φ = 663385648.

The previous prime is 663385637. The next prime is 663385651. The reversal of 663385649 is 946583366.

663385649 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., 402724624 + 260661025 = 20068^2 + 16145^2 .

It is a cyclic number.

It is not a de Polignac number, because 663385649 - 2⁴ = 663385633 is a prime.

It is a super-3 number, since 3×663385649³ (a number of 27 digits) contains 333 as substring.

Together with 663385651, 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 = 663385597 and 663385606.

It is not a weakly prime, because it can be changed into another prime (663385949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331692824 + 331692825.

It is an arithmetic number, because the mean of its divisors is an integer number (331692825).

Almost surely, 2^663385649 is an apocalyptic number.

It is an amenable number.

663385649 is a deficient number, since it is larger than the sum of its proper divisors (1).

663385649 is an equidigital number, since it uses as much as digits as its factorization.

663385649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 50.

The square root of 663385649 is about 25756.2739735390. The cubic root of 663385649 is about 872.1449907777.

The spelling of 663385649 in words is "six hundred sixty-three million, three hundred eighty-five thousand, six hundred forty-nine".