1666359912 has 64 divisors (see below), whose sum is σ = 4773772800. Its totient is φ = 474828480.

The previous prime is 1666359887. The next prime is 1666359917. The reversal of 1666359912 is 2199536661.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1666359917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50587 + ... + 76757.

It is an arithmetic number, because the mean of its divisors is an integer number (74590200).

Almost surely, 2^1666359912 is an apocalyptic number.

1666359912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666359912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386886400).

1666359912 is an abundant number, since it is smaller than the sum of its proper divisors (3107412888).

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

1666359912 is a wasteful number, since it uses less digits than its factorization.

1666359912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26566 (or 26562 counting only the distinct ones).

The product of its digits is 524880, while the sum is 48.

The square root of 1666359912 is about 40821.0719114528. The cubic root of 1666359912 is about 1185.5583574589.

The spelling of 1666359912 in words is "one billion, six hundred sixty-six million, three hundred fifty-nine thousand, nine hundred twelve".