1666064045 has 4 divisors (see below), whose sum is σ = 1999276860. Its totient is φ = 1332851232.

The previous prime is 1666064017. The next prime is 1666064051. The reversal of 1666064045 is 5404606661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467381161 + 1198682884 = 21619^2 + 34622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666064045 - 2¹² = 1666059949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166606400 + ... + 166606409.

It is an arithmetic number, because the mean of its divisors is an integer number (499819215).

Almost surely, 2^1666064045 is an apocalyptic number.

It is an amenable number.

1666064045 is a deficient number, since it is larger than the sum of its proper divisors (333212815).

1666064045 is an equidigital number, since it uses as much as digits as its factorization.

1666064045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333212814.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 1666064045 is about 40817.4478011548. The cubic root of 1666064045 is about 1185.4881868725.

The spelling of 1666064045 in words is "one billion, six hundred sixty-six million, sixty-four thousand, forty-five".