1666845180 has 648 divisors, whose sum is σ = 7084031136. Its totient is φ = 308689920.

The previous prime is 1666845157. The next prime is 1666845217. The reversal of 1666845180 is 815486661.

1666845180 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 57477406 + ... + 57477434.

Almost surely, 2^1666845180 is an apocalyptic number.

1666845180 is a gapful number since it is divisible by the number (10) 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 1666845180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3542015568).

1666845180 is an abundant number, since it is smaller than the sum of its proper divisors (5417185956).

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

1666845180 is a wasteful number, since it uses less digits than its factorization.

1666845180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1666845180 is about 40827.0153207408. The cubic root of 1666845180 is about 1185.6734301775.

The spelling of 1666845180 in words is "one billion, six hundred sixty-six million, eight hundred forty-five thousand, one hundred eighty".