663455 has 16 divisors (see below), whose sum is σ = 876960. Its totient is φ = 478848.

The previous prime is 663437. The next prime is 663463. The reversal of 663455 is 554366.

It is a cyclic number.

It is not a de Polignac number, because 663455 - 2¹⁸ = 401311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3749 + ... + 3921.

It is an arithmetic number, because the mean of its divisors is an integer number (54810).

2⁶⁶³⁴⁵⁵ is an apocalyptic number.

663455 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

663455 is a deficient number, since it is larger than the sum of its proper divisors (213505).

663455 is a wasteful number, since it uses less digits than its factorization.

663455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its digits is 10800, while the sum is 29.

The square root of 663455 is about 814.5274703778. The cubic root of 663455 is about 87.2175381356.

The spelling of 663455 in words is "six hundred sixty-three thousand, four hundred fifty-five".