1666071211 has 16 divisors (see below), whose sum is σ = 1930521600. Its totient is φ = 1408275648.

The previous prime is 1666071193. The next prime is 1666071229. The reversal of 1666071211 is 1121706661.

It is an interprime number because it is at equal distance from previous prime (1666071193) and next prime (1666071229).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666071211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666071611) 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 15 ways as a sum of consecutive naturals, for example, 695031 + ... + 697423.

It is an arithmetic number, because the mean of its divisors is an integer number (120657600).

Almost surely, 2^1666071211 is an apocalyptic number.

1666071211 is a deficient number, since it is larger than the sum of its proper divisors (264450389).

1666071211 is a wasteful number, since it uses less digits than its factorization.

1666071211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1666071211 is about 40817.5355821490. The cubic root of 1666071211 is about 1185.4898865263.

Adding to 1666071211 its reverse (1121706661), we get a palindrome (2787777872).

The spelling of 1666071211 in words is "one billion, six hundred sixty-six million, seventy-one thousand, two hundred eleven".