1666335888 has 200 divisors, whose sum is σ = 5580767808. Its totient is φ = 470147328.

The previous prime is 1666335859. The next prime is 1666335889. The reversal of 1666335888 is 8885336661.

It is a super-3 number, since 3×1666335888³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1666335889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 751870 + ... + 754082.

Almost surely, 2^1666335888 is an apocalyptic number.

1666335888 is a gapful number since it is divisible by the number (18) 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 1666335888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2790383904).

1666335888 is an abundant number, since it is smaller than the sum of its proper divisors (3914431920).

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

1666335888 is a wasteful number, since it uses less digits than its factorization.

1666335888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323 (or 2308 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 1666335888 is about 40820.7776506034. Note that the first 3 decimals coincide. The cubic root of 1666335888 is about 1185.5526600121.

The spelling of 1666335888 in words is "one billion, six hundred sixty-six million, three hundred thirty-five thousand, eight hundred eighty-eight".