663081 has 8 divisors (see below), whose sum is σ = 930720. Its totient is φ = 418752.

The previous prime is 663071. The next prime is 663097. The reversal of 663081 is 180366.

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

It is not a de Polignac number, because 663081 - 2⁵ = 663049 is a prime.

It is a super-2 number, since 2×663081² = 879352825122, which contains 22 as substring.

663081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (663001) 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, 5760 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (116340).

2⁶⁶³⁰⁸¹ is an apocalyptic number.

It is an amenable number.

663081 is a deficient number, since it is larger than the sum of its proper divisors (267639).

663081 is a wasteful number, since it uses less digits than its factorization.

663081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11655.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 663081 is about 814.2978570523. The cubic root of 663081 is about 87.2011464232.

The spelling of 663081 in words is "six hundred sixty-three thousand, eighty-one".