163641656 has 8 divisors (see below), whose sum is σ = 306828120. Its totient is φ = 81820824.

The previous prime is 163641629. The next prime is 163641679. The reversal of 163641656 is 656146361.

163641656 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10227596 + ... + 10227611.

It is an arithmetic number, because the mean of its divisors is an integer number (38353515).

Almost surely, 2^163641656 is an apocalyptic number.

It is an amenable number.

163641656 is a deficient number, since it is larger than the sum of its proper divisors (143186464).

163641656 is a wasteful number, since it uses less digits than its factorization.

163641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20455213 (or 20455209 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 163641656 is about 12792.2498412125. The cubic root of 163641656 is about 546.9714042226.

The spelling of 163641656 in words is "one hundred sixty-three million, six hundred forty-one thousand, six hundred fifty-six".