1666226665 has 8 divisors (see below), whose sum is σ = 2015216640. Its totient is φ = 1322484912.

The previous prime is 1666226659. The next prime is 1666226669. The reversal of 1666226665 is 5666226661.

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 1666226665 - 2⁵ = 1666226633 is a prime.

It is a super-2 number, since 2×1666226665² = 5552622598314044450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666226669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1311355 + ... + 1312624.

It is an arithmetic number, because the mean of its divisors is an integer number (251902080).

Almost surely, 2^1666226665 is an apocalyptic number.

It is an amenable number.

1666226665 is a deficient number, since it is larger than the sum of its proper divisors (348989975).

1666226665 is a wasteful number, since it uses less digits than its factorization.

1666226665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624111.

The product of its digits is 933120, while the sum is 46.

The square root of 1666226665 is about 40819.4397928242. The cubic root of 1666226665 is about 1185.5267563816.

The spelling of 1666226665 in words is "one billion, six hundred sixty-six million, two hundred twenty-six thousand, six hundred sixty-five".