663544887 has 16 divisors (see below), whose sum is σ = 895365120. Its totient is φ = 437076000.

The previous prime is 663544883. The next prime is 663544891. The reversal of 663544887 is 788445366.

It is an interprime number because it is at equal distance from previous prime (663544883) and next prime (663544891).

It is not a de Polignac number, because 663544887 - 2² = 663544883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663544883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82689 + ... + 90357.

It is an arithmetic number, because the mean of its divisors is an integer number (55960320).

Almost surely, 2^663544887 is an apocalyptic number.

663544887 is a deficient number, since it is larger than the sum of its proper divisors (231820233).

663544887 is a wasteful number, since it uses less digits than its factorization.

663544887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8014.

The product of its digits is 3870720, while the sum is 51.

The square root of 663544887 is about 25759.3650348762. The cubic root of 663544887 is about 872.2147679446.

The spelling of 663544887 in words is "six hundred sixty-three million, five hundred forty-four thousand, eight hundred eighty-seven".