163997568 has 128 divisors (see below), whose sum is σ = 553248000. Its totient is φ = 46849536.

The previous prime is 163997563. The next prime is 163997593. The reversal of 163997568 is 865799361.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163997563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20803 + ... + 27581.

It is an arithmetic number, because the mean of its divisors is an integer number (4322250).

Almost surely, 2^163997568 is an apocalyptic number.

163997568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163997568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276624000).

163997568 is an abundant number, since it is smaller than the sum of its proper divisors (389250432).

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

163997568 is an equidigital number, since it uses as much as digits as its factorization.

163997568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809 (or 6791 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 163997568 is about 12806.1535208664. The cubic root of 163997568 is about 547.3676617658.

The spelling of 163997568 in words is "one hundred sixty-three million, nine hundred ninety-seven thousand, five hundred sixty-eight".