164641666 has 24 divisors (see below), whose sum is σ = 289937340. Its totient is φ = 69908832.

The previous prime is 164641663. The next prime is 164641667. The reversal of 164641666 is 666146461.

It can be written as a sum of positive squares in 2 ways, for example, as 149548441 + 15093225 = 12229^2 + 3885^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (164641663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2976 + ... + 18388.

Almost surely, 2^164641666 is an apocalyptic number.

164641666 is a deficient number, since it is larger than the sum of its proper divisors (125295674).

164641666 is a wasteful number, since it uses less digits than its factorization.

164641666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15538 (or 15531 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 164641666 is about 12831.2768655345. The cubic root of 164641666 is about 548.0833184449.

The spelling of 164641666 in words is "one hundred sixty-four million, six hundred forty-one thousand, six hundred sixty-six".