2166660 has 36 divisors (see below), whose sum is σ = 6572748. Its totient is φ = 577728.

The previous prime is 2166629. The next prime is 2166673. The reversal of 2166660 is 666612.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 1887876 = 528^2 + 1374^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5839 + ... + 6198.

2^2166660 is an apocalyptic number.

2166660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166660 is an abundant number, since it is smaller than the sum of its proper divisors (4406088).

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

2166660 is a wasteful number, since it uses less digits than its factorization.

2166660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12052 (or 12047 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2166660 is about 1471.9578798322. The cubic root of 2166660 is about 129.3988018939.

The spelling of 2166660 in words is "two million, one hundred sixty-six thousand, six hundred sixty".