1665116200 has 96 divisors (see below), whose sum is σ = 4369140000. Its totient is φ = 584595200.

The previous prime is 1665116161. The next prime is 1665116251. The reversal of 1665116200 is 26115661.

It is a super-2 number, since 2×1665116200² = 5545223919004880000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50751 + ... + 76849.

It is an arithmetic number, because the mean of its divisors is an integer number (45511875).

Almost surely, 2^1665116200 is an apocalyptic number.

1665116200 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 1665116200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2184570000).

1665116200 is an abundant number, since it is smaller than the sum of its proper divisors (2704023800).

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

1665116200 is a wasteful number, since it uses less digits than its factorization.

1665116200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26155 (or 26146 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1665116200 is about 40805.8353670158. The cubic root of 1665116200 is about 1185.2633311296.

The spelling of 1665116200 in words is "one billion, six hundred sixty-five million, one hundred sixteen thousand, two hundred".