663343985 has 16 divisors (see below), whose sum is σ = 804266496. Its totient is φ = 525201408.

The previous prime is 663343969. The next prime is 663343991. The reversal of 663343985 is 589343366.

It is a cyclic number.

It is not a de Polignac number, because 663343985 - 2⁴ = 663343969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207872 + ... + 211038.

It is an arithmetic number, because the mean of its divisors is an integer number (50266656).

Almost surely, 2^663343985 is an apocalyptic number.

It is an amenable number.

663343985 is a deficient number, since it is larger than the sum of its proper divisors (140922511).

663343985 is a wasteful number, since it uses less digits than its factorization.

663343985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592.

The product of its digits is 1399680, while the sum is 47.

The square root of 663343985 is about 25755.4651481972. The cubic root of 663343985 is about 872.1267320119.

The spelling of 663343985 in words is "six hundred sixty-three million, three hundred forty-three thousand, nine hundred eighty-five".