163421685 has 32 divisors (see below), whose sum is σ = 332033280. Its totient is φ = 74706624.

The previous prime is 163421659. The next prime is 163421719. The reversal of 163421685 is 586124361.

It is a happy number.

163421685 is a `hidden beast` number, since 1 + 634 + 2 + 16 + 8 + 5 = 666.

It is not a de Polignac number, because 163421685 - 2⁵ = 163421653 is a prime.

It is a super-3 number, since 3×163421685³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85522 + ... + 87411.

It is an arithmetic number, because the mean of its divisors is an integer number (10376040).

Almost surely, 2^163421685 is an apocalyptic number.

163421685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163421685 is an abundant number, since it is smaller than the sum of its proper divisors (168611595).

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

163421685 is a wasteful number, since it uses less digits than its factorization.

163421685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172954 (or 172948 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 163421685 is about 12783.6491269121. The cubic root of 163421685 is about 546.7262103411.

The spelling of 163421685 in words is "one hundred sixty-three million, four hundred twenty-one thousand, six hundred eighty-five".