163537668 has 72 divisors (see below), whose sum is σ = 476706048. Its totient is φ = 46303488.

The previous prime is 163537667. The next prime is 163537721. The reversal of 163537668 is 866735361.

163537668 is a `hidden beast` number, since 1 + 635 + 3 + 7 + 6 + 6 + 8 = 666.

163537668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (163537667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25605 + ... + 31347.

Almost surely, 2^163537668 is an apocalyptic number.

163537668 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 163537668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238353024).

163537668 is an abundant number, since it is smaller than the sum of its proper divisors (313168380).

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

163537668 is a wasteful number, since it uses less digits than its factorization.

163537668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873 (or 5868 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 163537668 is about 12788.1847030765. The cubic root of 163537668 is about 546.8555198852.

The spelling of 163537668 in words is "one hundred sixty-three million, five hundred thirty-seven thousand, six hundred sixty-eight".