1666133730 has 24 divisors (see below), whose sum is σ = 4331947932. Its totient is φ = 444302304.

The previous prime is 1666133713. The next prime is 1666133741. The reversal of 1666133730 is 373316661.

It can be written as a sum of positive squares in 2 ways, for example, as 1438153929 + 227979801 = 37923^2 + 15099^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9256209 + ... + 9256388.

Almost surely, 2^1666133730 is an apocalyptic number.

1666133730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666133730 is an abundant number, since it is smaller than the sum of its proper divisors (2665814202).

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

1666133730 is a wasteful number, since it uses less digits than its factorization.

1666133730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18512610 (or 18512607 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 1666133730 is about 40818.3014100293. The cubic root of 1666133730 is about 1185.5047147671.

The spelling of 1666133730 in words is "one billion, six hundred sixty-six million, one hundred thirty-three thousand, seven hundred thirty".