663901 has 12 divisors (see below), whose sum is σ = 818748. Its totient is φ = 534912.

The previous prime is 663893. The next prime is 663907. The reversal of 663901 is 109366.

It can be written as a sum of positive squares in 2 ways, for example, as 423801 + 240100 = 651^2 + 490^2 .

It is not a de Polignac number, because 663901 - 2³ = 663893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (68229).

2⁶⁶³⁹⁰¹ is an apocalyptic number.

It is an amenable number.

663901 is a deficient number, since it is larger than the sum of its proper divisors (154847).

663901 is a wasteful number, since it uses less digits than its factorization.

663901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 663901 is about 814.8012027483. The cubic root of 663901 is about 87.2370774205.

The spelling of 663901 in words is "six hundred sixty-three thousand, nine hundred one".