663504409 has 2 divisors, whose sum is σ = 663504410. Its totient is φ = 663504408.

The previous prime is 663504397. The next prime is 663504421. The reversal of 663504409 is 904405366.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (663504397) and next prime (663504421).

It can be written as a sum of positive squares in only one way, i.e., 559464409 + 104040000 = 23653^2 + 10200^2 .

It is a cyclic number.

It is not a de Polignac number, because 663504409 - 2¹¹ = 663502361 is a prime.

It is not a weakly prime, because it can be changed into another prime (663504469) 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, 331752204 + 331752205.

It is an arithmetic number, because the mean of its divisors is an integer number (331752205).

Almost surely, 2^663504409 is an apocalyptic number.

It is an amenable number.

663504409 is a deficient number, since it is larger than the sum of its proper divisors (1).

663504409 is an equidigital number, since it uses as much as digits as its factorization.

663504409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 663504409 is about 25758.5793280608. The cubic root of 663504409 is about 872.1970317784.

The spelling of 663504409 in words is "six hundred sixty-three million, five hundred four thousand, four hundred nine".