1666056065 has 8 divisors (see below), whose sum is σ = 1999504680. Its totient is φ = 1332686592.

The previous prime is 1666056031. The next prime is 1666056079. The reversal of 1666056065 is 5606506661.

It can be written as a sum of positive squares in 4 ways, for example, as 106832896 + 1559223169 = 10336^2 + 39487^2 .

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 1666056065 - 2⁶ = 1666056001 is a prime.

It is a Curzon number.

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, 47081 + ... + 74489.

It is an arithmetic number, because the mean of its divisors is an integer number (249938085).

Almost surely, 2^1666056065 is an apocalyptic number.

It is an amenable number.

1666056065 is a deficient number, since it is larger than the sum of its proper divisors (333448615).

1666056065 is a wasteful number, since it uses less digits than its factorization.

1666056065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39571.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 1666056065 is about 40817.3500487232. The cubic root of 1666056065 is about 1185.4862941460.

The spelling of 1666056065 in words is "one billion, six hundred sixty-six million, fifty-six thousand, sixty-five".