2165383620 has 72 divisors (see below), whose sum is σ = 6584235840. Its totient is φ = 576037440.

The previous prime is 2165383613. The next prime is 2165383657. The reversal of 2165383620 is 263835612.

It is a happy number.

2165383620 is a `hidden beast` number, since 21 + 6 + 5 + 3 + 8 + 3 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 61065 + ... + 89775.

It is an arithmetic number, because the mean of its divisors is an integer number (91447720).

Almost surely, 2^2165383620 is an apocalyptic number.

2165383620 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 2165383620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3292117920).

2165383620 is an abundant number, since it is smaller than the sum of its proper divisors (4418852220).

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

2165383620 is a wasteful number, since it uses less digits than its factorization.

2165383620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29145 (or 29140 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2165383620 is about 46533.6826395677. The cubic root of 2165383620 is about 1293.7338727948.

The spelling of 2165383620 in words is "two billion, one hundred sixty-five million, three hundred eighty-three thousand, six hundred twenty".