663575509 has 2 divisors, whose sum is σ = 663575510. Its totient is φ = 663575508.

The previous prime is 663575359. The next prime is 663575533. The reversal of 663575509 is 905575366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488542609 + 175032900 = 22103^2 + 13230^2 .

It is a cyclic number.

It is not a de Polignac number, because 663575509 - 2¹⁷ = 663444437 is a prime.

It is a super-2 number, since 2×663575509² = 880664912289218162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663575009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331787754 + 331787755.

It is an arithmetic number, because the mean of its divisors is an integer number (331787755).

Almost surely, 2^663575509 is an apocalyptic number.

It is an amenable number.

663575509 is a deficient number, since it is larger than the sum of its proper divisors (1).

663575509 is an equidigital number, since it uses as much as digits as its factorization.

663575509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 850500, while the sum is 46.

The square root of 663575509 is about 25759.9594137879. The cubic root of 663575509 is about 872.2281850474.

The spelling of 663575509 in words is "six hundred sixty-three million, five hundred seventy-five thousand, five hundred nine".