1666300645 has 8 divisors (see below), whose sum is σ = 2117182104. Its totient is φ = 1254626304.

The previous prime is 1666300607. The next prime is 1666300651. The reversal of 1666300645 is 5460036661.

It can be written as a sum of positive squares in 4 ways, for example, as 364389921 + 1301910724 = 19089^2 + 36082^2 .

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 1666300645 - 2¹¹ = 1666298597 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 9801684 + ... + 9801853.

It is an arithmetic number, because the mean of its divisors is an integer number (264647763).

Almost surely, 2^1666300645 is an apocalyptic number.

It is an amenable number.

1666300645 is a deficient number, since it is larger than the sum of its proper divisors (450881459).

1666300645 is a wasteful number, since it uses less digits than its factorization.

1666300645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19603559.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1666300645 is about 40820.3459686466. The cubic root of 1666300645 is about 1185.5443018079.

The spelling of 1666300645 in words is "one billion, six hundred sixty-six million, three hundred thousand, six hundred forty-five".