1666105200 has 360 divisors, whose sum is σ = 6115973136. Its totient is φ = 435456000.

The previous prime is 1666105157. The next prime is 1666105201. The reversal of 1666105200 is 25016661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666105201) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5929060 + ... + 5929340.

Almost surely, 2^1666105200 is an apocalyptic number.

1666105200 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 1666105200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3057986568).

1666105200 is an abundant number, since it is smaller than the sum of its proper divisors (4449867936).

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

1666105200 is a wasteful number, since it uses less digits than its factorization.

1666105200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1666105200 is about 40817.9519329424. The cubic root of 1666105200 is about 1185.4979480748.

The spelling of 1666105200 in words is "one billion, six hundred sixty-six million, one hundred five thousand, two hundred".