663827897 has 2 divisors, whose sum is σ = 663827898. Its totient is φ = 663827896.

The previous prime is 663827887. The next prime is 663827903. The reversal of 663827897 is 798728366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608904976 + 54922921 = 24676^2 + 7411^2 .

It is a cyclic number.

It is not a de Polignac number, because 663827897 - 2⁴ = 663827881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663827867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331913948 + 331913949.

It is an arithmetic number, because the mean of its divisors is an integer number (331913949).

Almost surely, 2^663827897 is an apocalyptic number.

It is an amenable number.

663827897 is a deficient number, since it is larger than the sum of its proper divisors (1).

663827897 is an equidigital number, since it uses as much as digits as its factorization.

663827897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The square root of 663827897 is about 25764.8577911853. The cubic root of 663827897 is about 872.3387537369.

The spelling of 663827897 in words is "six hundred sixty-three million, eight hundred twenty-seven thousand, eight hundred ninety-seven".