663641753 has 4 divisors (see below), whose sum is σ = 674521188. Its totient is φ = 652762320.

The previous prime is 663641729. The next prime is 663641773. The reversal of 663641753 is 357146366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 214710409 + 448931344 = 14653^2 + 21188^2 .

It is a cyclic number.

It is not a de Polignac number, because 663641753 - 2⁸ = 663641497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663641753.

It is not an unprimeable number, because it can be changed into a prime (663641723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5439626 + ... + 5439747.

It is an arithmetic number, because the mean of its divisors is an integer number (168630297).

Almost surely, 2^663641753 is an apocalyptic number.

It is an amenable number.

663641753 is a deficient number, since it is larger than the sum of its proper divisors (10879435).

663641753 is a wasteful number, since it uses less digits than its factorization.

663641753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10879434.

The product of its digits is 272160, while the sum is 41.

The square root of 663641753 is about 25761.2451756510. The cubic root of 663641753 is about 872.2572086026.

The spelling of 663641753 in words is "six hundred sixty-three million, six hundred forty-one thousand, seven hundred fifty-three".