663884985 has 32 divisors (see below), whose sum is σ = 1119957120. Its totient is φ = 334886400.

The previous prime is 663884983. The next prime is 663884987. The reversal of 663884985 is 589488366.

It is an interprime number because it is at equal distance from previous prime (663884983) and next prime (663884987).

It is not a de Polignac number, because 663884985 - 2¹ = 663884983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (663884981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215355 + ... + 218415.

It is an arithmetic number, because the mean of its divisors is an integer number (34998660).

Almost surely, 2^663884985 is an apocalyptic number.

It is an amenable number.

663884985 is a deficient number, since it is larger than the sum of its proper divisors (456072135).

663884985 is a wasteful number, since it uses less digits than its factorization.

663884985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849.

The product of its digits is 9953280, while the sum is 57.

The square root of 663884985 is about 25765.9656329818. The cubic root of 663884985 is about 872.3637595391.

The spelling of 663884985 in words is "six hundred sixty-three million, eight hundred eighty-four thousand, nine hundred eighty-five".