163643652 has 30 divisors (see below), whose sum is σ = 427797678. Its totient is φ = 54547776.

The previous prime is 163643647. The next prime is 163643693. The reversal of 163643652 is 256346361.

163643652 is a `hidden beast` number, since 1 + 6 + 3 + 643 + 6 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 83612736 + 80030916 = 9144^2 + 8946^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 252213 + ... + 252860.

Almost surely, 2^163643652 is an apocalyptic number.

163643652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

163643652 is an abundant number, since it is smaller than the sum of its proper divisors (264154026).

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

163643652 is a wasteful number, since it uses less digits than its factorization.

163643652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505089 (or 505078 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 163643652 is about 12792.3278569618. The cubic root of 163643652 is about 546.9736280869.

The spelling of 163643652 in words is "one hundred sixty-three million, six hundred forty-three thousand, six hundred fifty-two".