166660000 has 120 divisors (see below), whose sum is σ = 442236564. Its totient is φ = 61440000.

The previous prime is 166659989. The next prime is 166660003. The reversal of 166660000 is 66661.

166660000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 10 ways, for example, as 9809424 + 156850576 = 3132^2 + 12524^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166660003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 259680 + ... + 260320.

Almost surely, 2^166660000 is an apocalyptic number.

166660000 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 166660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221118282).

166660000 is an abundant number, since it is smaller than the sum of its proper divisors (275576564).

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

166660000 is an equidigital number, since it uses as much as digits as its factorization.

166660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 166660000 is about 12909.6862858863. The cubic root of 166660000 is about 550.3138704352.

The spelling of 166660000 in words is "one hundred sixty-six million, six hundred sixty thousand".