163666624 has 56 divisors (see below), whose sum is σ = 355811328. Its totient is φ = 74077440.

The previous prime is 163666603. The next prime is 163666631. The reversal of 163666624 is 426666361.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269329 + ... + 269935.

Almost surely, 2^163666624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163666624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177905664).

163666624 is an abundant number, since it is smaller than the sum of its proper divisors (192144704).

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

163666624 is a wasteful number, since it uses less digits than its factorization.

163666624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1003 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 163666624 is about 12793.2257073812. The cubic root of 163666624 is about 546.9992212790. Note that the first 3 decimals are identical.

The spelling of 163666624 in words is "one hundred sixty-three million, six hundred sixty-six thousand, six hundred twenty-four".