163351666 has 4 divisors (see below), whose sum is σ = 245027502. Its totient is φ = 81675832.

The previous prime is 163351663. The next prime is 163351673. The reversal of 163351666 is 666153361.

163351666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666153361 = 2609 ⋅255329.

It can be written as a sum of positive squares in only one way, i.e., 83338641 + 80013025 = 9129^2 + 8945^2 .

It is not an unprimeable number, because it can be changed into a prime (163351663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837915 + ... + 40837918.

Almost surely, 2^163351666 is an apocalyptic number.

163351666 is a deficient number, since it is larger than the sum of its proper divisors (81675836).

163351666 is an equidigital number, since it uses as much as digits as its factorization.

163351666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81675835.

The product of its digits is 58320, while the sum is 37.

The square root of 163351666 is about 12780.9102179774. The cubic root of 163351666 is about 546.6481164801.

The spelling of 163351666 in words is "one hundred sixty-three million, three hundred fifty-one thousand, six hundred sixty-six".