1665305000 has 80 divisors (see below), whose sum is σ = 3957608160. Its totient is φ = 656600000.

The previous prime is 1665304999. The next prime is 1665305003. The reversal of 1665305000 is 5035661.

It is not an unprimeable number, because it can be changed into a prime (1665305003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 352655 + ... + 357345.

It is an arithmetic number, because the mean of its divisors is an integer number (49470102).

Almost surely, 2^1665305000 is an apocalyptic number.

1665305000 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 1665305000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978804080).

1665305000 is an abundant number, since it is smaller than the sum of its proper divisors (2292303160).

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

1665305000 is an equidigital number, since it uses as much as digits as its factorization.

1665305000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1665305000 is about 40808.1486960631. The cubic root of 1665305000 is about 1185.3081266539.

The spelling of 1665305000 in words is "one billion, six hundred sixty-five million, three hundred five thousand".