1666441011 has 32 divisors (see below), whose sum is σ = 2351255040. Its totient is φ = 1047774464.

The previous prime is 1666441009. The next prime is 1666441019. The reversal of 1666441011 is 1101446661.

It is a cyclic number.

It is not a de Polignac number, because 1666441011 - 2¹ = 1666441009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666441011.

It is not an unprimeable number, because it can be changed into a prime (1666441019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1634860 + ... + 1635878.

It is an arithmetic number, because the mean of its divisors is an integer number (73476720).

Almost surely, 2^1666441011 is an apocalyptic number.

1666441011 is a deficient number, since it is larger than the sum of its proper divisors (684814029).

1666441011 is a wasteful number, since it uses less digits than its factorization.

1666441011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1666441011 is about 40822.0652466286. The cubic root of 1666441011 is about 1185.5775902063.

Adding to 1666441011 its reverse (1101446661), we get a palindrome (2767887672).

It can be divided in two parts, 16664 and 41011, that added together give a palindrome (57675).

The spelling of 1666441011 in words is "one billion, six hundred sixty-six million, four hundred forty-one thousand, eleven".