663667517 has 2 divisors, whose sum is σ = 663667518. Its totient is φ = 663667516.

The previous prime is 663667513. The next prime is 663667559. The reversal of 663667517 is 715766366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658743556 + 4923961 = 25666^2 + 2219^2 .

It is a cyclic number.

It is not a de Polignac number, because 663667517 - 2² = 663667513 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663667513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331833758 + 331833759.

It is an arithmetic number, because the mean of its divisors is an integer number (331833759).

Almost surely, 2^663667517 is an apocalyptic number.

It is an amenable number.

663667517 is a deficient number, since it is larger than the sum of its proper divisors (1).

663667517 is an equidigital number, since it uses as much as digits as its factorization.

663667517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 663667517 is about 25761.7452242662. The cubic root of 663667517 is about 872.2684960901.

The spelling of 663667517 in words is "six hundred sixty-three million, six hundred sixty-seven thousand, five hundred seventeen".