981663585 has 16 divisors (see below), whose sum is σ = 1795042176. Its totient is φ = 448760448.

The previous prime is 981663569. The next prime is 981663593. The reversal of 981663585 is 585366189.

It is not a de Polignac number, because 981663585 - 2⁴ = 981663569 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 15 ways as a sum of consecutive naturals, for example, 4674484 + ... + 4674693.

It is an arithmetic number, because the mean of its divisors is an integer number (112190136).

Almost surely, 2^981663585 is an apocalyptic number.

It is an amenable number.

981663585 is a deficient number, since it is larger than the sum of its proper divisors (813378591).

981663585 is a wasteful number, since it uses less digits than its factorization.

981663585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9349192.

The product of its digits is 1555200, while the sum is 51.

The square root of 981663585 is about 31331.5110551662. The cubic root of 981663585 is about 993.8501181516.

The spelling of 981663585 in words is "nine hundred eighty-one million, six hundred sixty-three thousand, five hundred eighty-five".