663904653 has 8 divisors (see below), whose sum is σ = 909130848. Its totient is φ = 430640784.

The previous prime is 663904651. The next prime is 663904679. The reversal of 663904653 is 356409366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663904653 - 2¹ = 663904651 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663904651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2990451 + ... + 2990672.

It is an arithmetic number, because the mean of its divisors is an integer number (113641356).

Almost surely, 2^663904653 is an apocalyptic number.

It is an amenable number.

663904653 is a deficient number, since it is larger than the sum of its proper divisors (245226195).

663904653 is a wasteful number, since it uses less digits than its factorization.

663904653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981163.

The product of its (nonzero) digits is 349920, while the sum is 42.

The square root of 663904653 is about 25766.3472964252. The cubic root of 663904653 is about 872.3723742246.

The spelling of 663904653 in words is "six hundred sixty-three million, nine hundred four thousand, six hundred fifty-three".