1666085200 has 60 divisors (see below), whose sum is σ = 4310688508. Its totient is φ = 615168000.

The previous prime is 1666085189. The next prime is 1666085209. The reversal of 1666085200 is 25806661.

It can be written as a sum of positive squares in 6 ways, for example, as 640292416 + 1025792784 = 25304^2 + 32028^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666085209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155001 + ... + 165400.

Almost surely, 2^1666085200 is an apocalyptic number.

1666085200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666085200 is an abundant number, since it is smaller than the sum of its proper divisors (2644603308).

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

1666085200 is a wasteful number, since it uses less digits than its factorization.

1666085200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320432 (or 320421 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1666085200 is about 40817.7069419633. The cubic root of 1666085200 is about 1185.4932044660.

The spelling of 1666085200 in words is "one billion, six hundred sixty-six million, eighty-five thousand, two hundred".