1663298988 has 96 divisors (see below), whose sum is σ = 4507184640. Its totient is φ = 472988160.

The previous prime is 1663298951. The next prime is 1663298993. The reversal of 1663298988 is 8898923661.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114681 + ... + 128367.

It is an arithmetic number, because the mean of its divisors is an integer number (46949840).

Almost surely, 2^1663298988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663298988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2253592320).

1663298988 is an abundant number, since it is smaller than the sum of its proper divisors (2843885652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663298988 is a wasteful number, since it uses less digits than its factorization.

1663298988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13767 (or 13765 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 60.

The square root of 1663298988 is about 40783.5627183305. The cubic root of 1663298988 is about 1184.8319981167.

The spelling of 1663298988 in words is "one billion, six hundred sixty-three million, two hundred ninety-eight thousand, nine hundred eighty-eight".