1665045000 has 240 divisors, whose sum is σ = 5694614640. Its totient is φ = 439344000.

The previous prime is 1665044971. The next prime is 1665045023. The reversal of 1665045000 is 5405661.

It is a happy number.

1665045000 is a `hidden beast` number, since 1 + 6 + 650 + 4 + 5 + 0 + 0 + 0 = 666.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 7334887 + ... + 7335113.

It is an arithmetic number, because the mean of its divisors is an integer number (23727561).

Almost surely, 2^1665045000 is an apocalyptic number.

1665045000 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 1665045000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2847307320).

1665045000 is an abundant number, since it is smaller than the sum of its proper divisors (4029569640).

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

1665045000 is a wasteful number, since it uses less digits than its factorization.

1665045000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1665045000 is about 40804.9629334472. The cubic root of 1665045000 is about 1185.2464370229.

The spelling of 1665045000 in words is "one billion, six hundred sixty-five million, forty-five thousand".