166662665 has 32 divisors (see below), whose sum is σ = 224695296. Its totient is φ = 117838080.

The previous prime is 166662659. The next prime is 166662667. The reversal of 166662665 is 566266661.

It is not a de Polignac number, because 166662665 - 2⁴ = 166662649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166662667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215219 + ... + 215991.

It is an arithmetic number, because the mean of its divisors is an integer number (7021728).

Almost surely, 2^166662665 is an apocalyptic number.

It is an amenable number.

166662665 is a deficient number, since it is larger than the sum of its proper divisors (58032631).

166662665 is a wasteful number, since it uses less digits than its factorization.

166662665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its digits is 466560, while the sum is 44.

The square root of 166662665 is about 12909.7895025442. The cubic root of 166662665 is about 550.3168037098.

The spelling of 166662665 in words is "one hundred sixty-six million, six hundred sixty-two thousand, six hundred sixty-five".