163680324816 has 20 divisors (see below), whose sum is σ = 422840839232. Its totient is φ = 54560108256.

The previous prime is 163680324791. The next prime is 163680324833. The reversal of 163680324816 is 618423086361.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 3410006767 = 163680324816 / (1 + 6 + 3 + 6 + 8 + 0 + 3 + 2 + 4 + 8 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705003336 + ... + 1705003431.

Almost surely, 2^163680324816 is an apocalyptic number.

163680324816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

163680324816 is an abundant number, since it is smaller than the sum of its proper divisors (259160514416).

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

163680324816 is a wasteful number, since it uses less digits than its factorization.

163680324816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410006778 (or 3410006772 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 163680324816 in words is "one hundred sixty-three billion, six hundred eighty million, three hundred twenty-four thousand, eight hundred sixteen".