13115525420440 has 128 divisors (see below), whose sum is σ = 31994933256000. Its totient is φ = 4819391152128.

The previous prime is 13115525420429. The next prime is 13115525420449. The reversal of 13115525420440 is 4402452551131.

It is a self number, because there is not a number n which added to its sum of digits gives 13115525420440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13115525420449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41627016 + ... + 41940904.

Almost surely, 2^{13115525420440} is an apocalyptic number.

13115525420440 is a gapful number since it is divisible by the number (10) 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 13115525420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15997466628000).

13115525420440 is an abundant number, since it is smaller than the sum of its proper divisors (18879407835560).

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

13115525420440 is a wasteful number, since it uses less digits than its factorization.

13115525420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315389 (or 315385 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 13115525420440 its reverse (4402452551131), we get a palindrome (17517977971571).

The spelling of 13115525420440 in words is "thirteen trillion, one hundred fifteen billion, five hundred twenty-five million, four hundred twenty thousand, four hundred forty".