663550271 has 2 divisors, whose sum is σ = 663550272. Its totient is φ = 663550270.

The previous prime is 663550259. The next prime is 663550291. The reversal of 663550271 is 172055366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663550271 - 2¹⁴ = 663533887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663550231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331775135 + 331775136.

It is an arithmetic number, because the mean of its divisors is an integer number (331775136).

Almost surely, 2^663550271 is an apocalyptic number.

663550271 is a deficient number, since it is larger than the sum of its proper divisors (1).

663550271 is an equidigital number, since it uses as much as digits as its factorization.

663550271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 663550271 is about 25759.4695403457. The cubic root of 663550271 is about 872.2171269870.

The spelling of 663550271 in words is "six hundred sixty-three million, five hundred fifty thousand, two hundred seventy-one".