663553 has 8 divisors (see below), whose sum is σ = 730080. Its totient is φ = 598080.

The previous prime is 663547. The next prime is 663557. The reversal of 663553 is 355366.

663553 is nontrivially palindromic in base 15.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663553 is a prime.

It is a Duffinian number.

663553 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (663557) 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, 1801 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

It is a Proth number, since it is equal to 81 ⋅ 2¹³ + 1 and 81 < 2¹³.

2⁶⁶³⁵⁵³ is an apocalyptic number.

It is an amenable number.

663553 is a deficient number, since it is larger than the sum of its proper divisors (66527).

663553 is a wasteful number, since it uses less digits than its factorization.

663553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527.

The product of its digits is 8100, while the sum is 28.

The square root of 663553 is about 814.5876257346. The cubic root of 663553 is about 87.2218322715.

The spelling of 663553 in words is "six hundred sixty-three thousand, five hundred fifty-three".