163665481 has 16 divisors (see below), whose sum is σ = 193616640. Its totient is φ = 135429120.

The previous prime is 163665451. The next prime is 163665499. The reversal of 163665481 is 184566361.

It is a cyclic number.

It is not a de Polignac number, because 163665481 - 2¹⁵ = 163632713 is a prime.

It is a super-2 number, since 2×163665481² = 53572779341922722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163665451) 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, 24900 + ... + 30778.

It is an arithmetic number, because the mean of its divisors is an integer number (12101040).

Almost surely, 2^163665481 is an apocalyptic number.

It is an amenable number.

163665481 is a deficient number, since it is larger than the sum of its proper divisors (29951159).

163665481 is an equidigital number, since it uses as much as digits as its factorization.

163665481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024.

The product of its digits is 103680, while the sum is 40.

The square root of 163665481 is about 12793.1810352234. The cubic root of 163665481 is about 546.9979479150.

The spelling of 163665481 in words is "one hundred sixty-three million, six hundred sixty-five thousand, four hundred eighty-one".