1663998585 has 8 divisors (see below), whose sum is σ = 2662397760. Its totient is φ = 887465904.

The previous prime is 1663998559. The next prime is 1663998593. The reversal of 1663998585 is 5858993661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663998585 - 2⁹ = 1663998073 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 55466605 + ... + 55466634.

It is an arithmetic number, because the mean of its divisors is an integer number (332799720).

Almost surely, 2^1663998585 is an apocalyptic number.

1663998585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663998585 is a deficient number, since it is larger than the sum of its proper divisors (998399175).

1663998585 is a wasteful number, since it uses less digits than its factorization.

1663998585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110933247.

The product of its digits is 13996800, while the sum is 60.

The square root of 1663998585 is about 40792.1387647179. The cubic root of 1663998585 is about 1184.9980914709.

The spelling of 1663998585 in words is "one billion, six hundred sixty-three million, nine hundred ninety-eight thousand, five hundred eighty-five".