1666430109 has 12 divisors (see below), whose sum is σ = 2511721056. Its totient is φ = 1062650952.

The previous prime is 1666430071. The next prime is 1666430113. The reversal of 1666430109 is 9010346661.

It is not a de Polignac number, because 1666430109 - 2¹⁹ = 1665905821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666430189) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4024987 + ... + 4025400.

It is an arithmetic number, because the mean of its divisors is an integer number (209310088).

Almost surely, 2^1666430109 is an apocalyptic number.

It is an amenable number.

1666430109 is a deficient number, since it is larger than the sum of its proper divisors (845290947).

1666430109 is a wasteful number, since it uses less digits than its factorization.

1666430109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050416 (or 8050413 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1666430109 is about 40821.9317156844. The cubic root of 1666430109 is about 1185.5750048172.

It can be divided in two parts, 16 and 66430109, that added together give a cube (66430125 = 405³).

The spelling of 1666430109 in words is "one billion, six hundred sixty-six million, four hundred thirty thousand, one hundred nine".