665241563 has 4 divisors (see below), whose sum is σ = 760276080. Its totient is φ = 570207048.

The previous prime is 665241553. The next prime is 665241649. The reversal of 665241563 is 365142566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665241563 - 2²⁴ = 648464347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665241553) 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 in 3 ways as a sum of consecutive naturals, for example, 47517248 + ... + 47517261.

It is an arithmetic number, because the mean of its divisors is an integer number (190069020).

Almost surely, 2^665241563 is an apocalyptic number.

665241563 is a deficient number, since it is larger than the sum of its proper divisors (95034517).

665241563 is an equidigital number, since it uses as much as digits as its factorization.

665241563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95034516.

The product of its digits is 129600, while the sum is 38.

The square root of 665241563 is about 25792.2771968665. The cubic root of 665241563 is about 872.9575493040.

The spelling of 665241563 in words is "six hundred sixty-five million, two hundred forty-one thousand, five hundred sixty-three".