213502544525 has 6 divisors (see below), whose sum is σ = 264743155242. Its totient is φ = 170802035600.

The previous prime is 213502544509. The next prime is 213502544527. The reversal of 213502544525 is 525445205312.

It can be written as a sum of positive squares in 3 ways, for example, as 1816975876 + 211685568649 = 42626^2 + 460093^2 .

It is not a de Polignac number, because 213502544525 - 2⁴ = 213502544509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213502544527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4270050866 + ... + 4270050915.

It is an arithmetic number, because the mean of its divisors is an integer number (44123859207).

Almost surely, 2^213502544525 is an apocalyptic number.

213502544525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213502544525 is a deficient number, since it is larger than the sum of its proper divisors (51240610717).

213502544525 is an equidigital number, since it uses as much as digits as its factorization.

213502544525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8540101791 (or 8540101786 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 38.

Adding to 213502544525 its reverse (525445205312), we get a palindrome (738947749837).

The spelling of 213502544525 in words is "two hundred thirteen billion, five hundred two million, five hundred forty-four thousand, five hundred twenty-five".