166505660 has 12 divisors (see below), whose sum is σ = 349661928. Its totient is φ = 66602256.

The previous prime is 166505639. The next prime is 166505663. The reversal of 166505660 is 66505661.

It is a self number, because there is not a number n which added to its sum of digits gives 166505660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166505663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162622 + ... + 4162661.

It is an arithmetic number, because the mean of its divisors is an integer number (29138494).

Almost surely, 2^166505660 is an apocalyptic number.

166505660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166505660 is an abundant number, since it is smaller than the sum of its proper divisors (183156268).

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

166505660 is a wasteful number, since it uses less digits than its factorization.

166505660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325292 (or 8325290 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 166505660 is about 12903.7072192452. The cubic root of 166505660 is about 550.1439402876.

Subtracting from 166505660 its reverse (66505661), we obtain a palindrome (99999999).

The spelling of 166505660 in words is "one hundred sixty-six million, five hundred five thousand, six hundred sixty".