2015522500 has 60 divisors (see below), whose sum is σ = 4426105068. Its totient is φ = 802816000.

The previous prime is 2015522461. The next prime is 2015522501. The reversal of 2015522500 is 52255102.

It can be written as a sum of positive squares in 10 ways, for example, as 255552196 + 1759970304 = 15986^2 + 41952^2 .

It is not an unprimeable number, because it can be changed into a prime (2015522501) 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, 640932 + ... + 644068.

Almost surely, 2^2015522500 is an apocalyptic number.

2015522500 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 2015522500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213052534).

2015522500 is an abundant number, since it is smaller than the sum of its proper divisors (2410582568).

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

2015522500 is a wasteful number, since it uses less digits than its factorization.

2015522500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3401 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2015522500 is about 44894.5709412619. The cubic root of 2015522500 is about 1263.1721741655.

Adding to 2015522500 its reverse (52255102), we get a palindrome (2067777602).

The spelling of 2015522500 in words is "two billion, fifteen million, five hundred twenty-two thousand, five hundred".