163638163816560 has 120 divisors (see below), whose sum is σ = 549555449220960. Its totient is φ = 43636530110976.

The previous prime is 163638163816531. The next prime is 163638163816613. The reversal of 163638163816560 is 65618361836361.

163638163816560 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 3 + 8 + 1 + 63 + 8 + 1 + 6 + 560 = 666.

163638163816560 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 (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109857246 + ... + 111336834.

It is an arithmetic number, because the mean of its divisors is an integer number (4579628743508).

Almost surely, 2^{163638163816560} is an apocalyptic number.

163638163816560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163638163816560 is an abundant number, since it is smaller than the sum of its proper divisors (385917285404400).

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

163638163816560 is a wasteful number, since it uses less digits than its factorization.

163638163816560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633215 (or 1633206 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 63.

The spelling of 163638163816560 in words is "one hundred sixty-three trillion, six hundred thirty-eight billion, one hundred sixty-three million, eight hundred sixteen thousand, five hundred sixty".