163640085 has 64 divisors (see below), whose sum is σ = 312064512. Its totient is φ = 71663616.

The previous prime is 163640083. The next prime is 163640107. The reversal of 163640085 is 580046361.

It is not a de Polignac number, because 163640085 - 2¹ = 163640083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163640083) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 283317 + ... + 283893.

It is an arithmetic number, because the mean of its divisors is an integer number (4876008).

Almost surely, 2^163640085 is an apocalyptic number.

163640085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163640085 is a deficient number, since it is larger than the sum of its proper divisors (148424427).

163640085 is a wasteful number, since it uses less digits than its factorization.

163640085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 163640085 is about 12792.1884366984. The cubic root of 163640085 is about 546.9696538639.

The spelling of 163640085 in words is "one hundred sixty-three million, six hundred forty thousand, eighty-five".