665225563 has 2 divisors, whose sum is σ = 665225564. Its totient is φ = 665225562.

The previous prime is 665225503. The next prime is 665225569. The reversal of 665225563 is 365522566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665225563 is a prime.

It is not a weakly prime, because it can be changed into another prime (665225569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332612781 + 332612782.

It is an arithmetic number, because the mean of its divisors is an integer number (332612782).

Almost surely, 2^665225563 is an apocalyptic number.

665225563 is a deficient number, since it is larger than the sum of its proper divisors (1).

665225563 is an equidigital number, since it uses as much as digits as its factorization.

665225563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 40.

The square root of 665225563 is about 25791.9670246377. The cubic root of 665225563 is about 872.9505506268.

The spelling of 665225563 in words is "six hundred sixty-five million, two hundred twenty-five thousand, five hundred sixty-three".