1663084785 has 32 divisors (see below), whose sum is σ = 2724504192. Its totient is φ = 866004480.

The previous prime is 1663084751. The next prime is 1663084793. The reversal of 1663084785 is 5874803661.

It is not a de Polignac number, because 1663084785 - 2¹⁰ = 1663083761 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118722 + ... + 131988.

It is an arithmetic number, because the mean of its divisors is an integer number (85140756).

Almost surely, 2^1663084785 is an apocalyptic number.

1663084785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663084785 is a deficient number, since it is larger than the sum of its proper divisors (1061419407).

1663084785 is a wasteful number, since it uses less digits than its factorization.

1663084785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13473.

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 1663084785 is about 40780.9365390252. The cubic root of 1663084785 is about 1184.7811342480.

The spelling of 1663084785 in words is "one billion, six hundred sixty-three million, eighty-four thousand, seven hundred eighty-five".