1666018368 has 280 divisors, whose sum is σ = 5830116864. Its totient is φ = 460339200.

The previous prime is 1666018357. The next prime is 1666018369. The reversal of 1666018368 is 8638106661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666018369) 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 39 ways as a sum of consecutive naturals, for example, 1124188 + ... + 1125668.

Almost surely, 2^1666018368 is an apocalyptic number.

1666018368 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 1666018368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2915058432).

1666018368 is an abundant number, since it is smaller than the sum of its proper divisors (4164098496).

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

1666018368 is a wasteful number, since it uses less digits than its factorization.

1666018368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1666018368 is about 40816.8882694406. Note that the first 3 decimals coincide. The cubic root of 1666018368 is about 1185.4773529475.

The spelling of 1666018368 in words is "one billion, six hundred sixty-six million, eighteen thousand, three hundred sixty-eight".