663828491 has 2 divisors, whose sum is σ = 663828492. Its totient is φ = 663828490.

The previous prime is 663828469. The next prime is 663828497. The reversal of 663828491 is 194828366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663828491 is a prime.

It is not a weakly prime, because it can be changed into another prime (663828497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331914245 + 331914246.

It is an arithmetic number, because the mean of its divisors is an integer number (331914246).

Almost surely, 2^663828491 is an apocalyptic number.

663828491 is a deficient number, since it is larger than the sum of its proper divisors (1).

663828491 is an equidigital number, since it uses as much as digits as its factorization.

663828491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 663828491 is about 25764.8693185120. The cubic root of 663828491 is about 872.3390139294.

The spelling of 663828491 in words is "six hundred sixty-three million, eight hundred twenty-eight thousand, four hundred ninety-one".