2165669240 has 64 divisors (see below), whose sum is σ = 5596992000. Its totient is φ = 738764928.

The previous prime is 2165669227. The next prime is 2165669249. The reversal of 2165669240 is 429665612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165669249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36287 + ... + 75153.

It is an arithmetic number, because the mean of its divisors is an integer number (87453000).

Almost surely, 2^2165669240 is an apocalyptic number.

2165669240 is a gapful number since it is divisible by the number (20) 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 2165669240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2798496000).

2165669240 is an abundant number, since it is smaller than the sum of its proper divisors (3431322760).

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

2165669240 is a wasteful number, since it uses less digits than its factorization.

2165669240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39084 (or 39080 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2165669240 is about 46536.7514981439. The cubic root of 2165669240 is about 1293.7907526351.

The spelling of 2165669240 in words is "two billion, one hundred sixty-five million, six hundred sixty-nine thousand, two hundred forty".