13215520131366 has 256 divisors, whose sum is σ = 31508886159360. Its totient is φ = 3617923345920.

The previous prime is 13215520131361. The next prime is 13215520131367. The reversal of 13215520131366 is 66313102551231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215520131361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5998873221 + ... + 5998875423.

It is an arithmetic number, because the mean of its divisors is an integer number (123081586560).

Almost surely, 2^{13215520131366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13215520131366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15754443079680).

13215520131366 is an abundant number, since it is smaller than the sum of its proper divisors (18293366027994).

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

13215520131366 is a wasteful number, since it uses less digits than its factorization.

13215520131366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739.

The product of its (nonzero) digits is 97200, while the sum is 39.

Adding to 13215520131366 its reverse (66313102551231), we get a palindrome (79528622682597).

The spelling of 13215520131366 in words is "thirteen trillion, two hundred fifteen billion, five hundred twenty million, one hundred thirty-one thousand, three hundred sixty-six".