166161660 has 192 divisors, whose sum is σ = 563576832. Its totient is φ = 35760384.

The previous prime is 166161659. The next prime is 166161673. The reversal of 166161660 is 66161661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 994897 + ... + 995063.

It is an arithmetic number, because the mean of its divisors is an integer number (2935296).

Almost surely, 2^166161660 is an apocalyptic number.

166161660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166161660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281788416).

166161660 is an abundant number, since it is smaller than the sum of its proper divisors (397415172).

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

166161660 is a wasteful number, since it uses less digits than its factorization.

166161660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 166161660 is about 12890.3708247668. The cubic root of 166161660 is about 549.7648140468.

Subtracting from 166161660 its reverse (66161661), we obtain a palindrome (99999999).

The spelling of 166161660 in words is "one hundred sixty-six million, one hundred sixty-one thousand, six hundred sixty".