163644660 has 72 divisors (see below), whose sum is σ = 512418816. Its totient is φ = 42229440.

The previous prime is 163644659. The next prime is 163644667. The reversal of 163644660 is 66446361.

163644660 is a `hidden beast` number, since 1 + 6 + 3 + 644 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163644667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9084 + ... + 20243.

It is an arithmetic number, because the mean of its divisors is an integer number (7116928).

Almost surely, 2^163644660 is an apocalyptic number.

163644660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163644660 is an abundant number, since it is smaller than the sum of its proper divisors (348774156).

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

163644660 is a wasteful number, since it uses less digits than its factorization.

163644660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29373 (or 29368 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 163644660 is about 12792.3672555161. The cubic root of 163644660 is about 546.9747511537.

The spelling of 163644660 in words is "one hundred sixty-three million, six hundred forty-four thousand, six hundred sixty".