164115666 has 128 divisors (see below), whose sum is σ = 437633280. Its totient is φ = 44928000.

The previous prime is 164115659. The next prime is 164115667. The reversal of 164115666 is 666511461.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 164115666.

It is not an unprimeable number, because it can be changed into a prime (164115667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 409066 + ... + 409466.

It is an arithmetic number, because the mean of its divisors is an integer number (3419010).

Almost surely, 2^164115666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 164115666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218816640).

164115666 is an abundant number, since it is smaller than the sum of its proper divisors (273517614).

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

164115666 is a wasteful number, since it uses less digits than its factorization.

164115666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 164115666 is about 12810.7636774706. The cubic root of 164115666 is about 547.4990204524.

The spelling of 164115666 in words is "one hundred sixty-four million, one hundred fifteen thousand, six hundred sixty-six".