1666441008 has 30 divisors (see below), whose sum is σ = 4663720724. Its totient is φ = 555480288.

The previous prime is 1666441003. The next prime is 1666441009. The reversal of 1666441008 is 8001446661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1666441001) 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 5 ways as a sum of consecutive naturals, for example, 5786110 + ... + 5786397.

Almost surely, 2^1666441008 is an apocalyptic number.

1666441008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1666441008 is an abundant number, since it is smaller than the sum of its proper divisors (2997279716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666441008 is a wasteful number, since it uses less digits than its factorization.

1666441008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572521 (or 11572512 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1666441008 is about 40822.0652098837. The cubic root of 1666441008 is about 1185.5775894948.

Adding to 1666441008 its reverse (8001446661), we get a palindrome (9667887669).

The spelling of 1666441008 in words is "one billion, six hundred sixty-six million, four hundred forty-one thousand, eight".