2165722050 has 48 divisors (see below), whose sum is σ = 5385762432. Its totient is φ = 575937600.

The previous prime is 2165722033. The next prime is 2165722057. The reversal of 2165722050 is 502275612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2165721999 and 2165722017.

It is not an unprimeable number, because it can be changed into a prime (2165722057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35380 + ... + 74720.

It is an arithmetic number, because the mean of its divisors is an integer number (112203384).

Almost surely, 2^2165722050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165722050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2692881216).

2165722050 is an abundant number, since it is smaller than the sum of its proper divisors (3220040382).

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

2165722050 is a wasteful number, since it uses less digits than its factorization.

2165722050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39723 (or 39718 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 2165722050 is about 46537.3188956992. The cubic root of 2165722050 is about 1293.8012689431.

Adding to 2165722050 its reverse (502275612), we get a palindrome (2667997662).

The spelling of 2165722050 in words is "two billion, one hundred sixty-five million, seven hundred twenty-two thousand, fifty".