2166665 has 8 divisors (see below), whose sum is σ = 2736960. Its totient is φ = 1642032.

The previous prime is 2166629. The next prime is 2166673. The reversal of 2166665 is 5666612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166665 - 2⁶ = 2166601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11309 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (342120).

2^2166665 is an apocalyptic number.

It is an amenable number.

2166665 is a deficient number, since it is larger than the sum of its proper divisors (570295).

2166665 is a wasteful number, since it uses less digits than its factorization.

2166665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22831.

The product of its digits is 12960, while the sum is 32.

The square root of 2166665 is about 1471.9595782493. The cubic root of 2166665 is about 129.3989014317.

The spelling of 2166665 in words is "two million, one hundred sixty-six thousand, six hundred sixty-five".