166056660 has 144 divisors (see below), whose sum is σ = 628048512. Its totient is φ = 34502400.

The previous prime is 166056647. The next prime is 166056661. The reversal of 166056660 is 66650661.

166056660 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

166056660 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166056661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7870 + ... + 19850.

It is an arithmetic number, because the mean of its divisors is an integer number (4361448).

Almost surely, 2^166056660 is an apocalyptic number.

166056660 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 166056660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314024256).

166056660 is an abundant number, since it is smaller than the sum of its proper divisors (461991852).

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

166056660 is a wasteful number, since it uses less digits than its factorization.

166056660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12014 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 166056660 is about 12886.2973735670. The cubic root of 166056660 is about 549.6489881519.

The spelling of 166056660 in words is "one hundred sixty-six million, fifty-six thousand, six hundred sixty".