663425 has 24 divisors (see below), whose sum is σ = 999936. Its totient is φ = 426240.

The previous prime is 663409. The next prime is 663437. The reversal of 663425 is 524366.

It is not a de Polignac number, because 663425 - 2⁴ = 663409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663394 and 663403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2864 + ... + 3086.

It is an arithmetic number, because the mean of its divisors is an integer number (41664).

2⁶⁶³⁴²⁵ is an apocalyptic number.

It is an amenable number.

663425 is a deficient number, since it is larger than the sum of its proper divisors (336511).

663425 is a wasteful number, since it uses less digits than its factorization.

663425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 252 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 663425 is about 814.5090545844. The cubic root of 663425 is about 87.2162235196.

The spelling of 663425 in words is "six hundred sixty-three thousand, four hundred twenty-five".