13125440021535 has 32 divisors (see below), whose sum is σ = 23574673510080. Its totient is φ = 6928067303424.

The previous prime is 13125440021503. The next prime is 13125440021569. The reversal of 13125440021535 is 53512004452131.

13125440021535 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 5 + 4 + 400 + 215 + 35 = 666.

It is not a de Polignac number, because 13125440021535 - 2⁵ = 13125440021503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13125440021535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 501149182 + ... + 501175371.

It is an arithmetic number, because the mean of its divisors is an integer number (736708547190).

Almost surely, 2^{13125440021535} is an apocalyptic number.

13125440021535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13125440021535 is a deficient number, since it is larger than the sum of its proper divisors (10449233488545).

13125440021535 is a wasteful number, since it uses less digits than its factorization.

13125440021535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002324664 (or 1002324658 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 13125440021535 its reverse (53512004452131), we get a palindrome (66637444473666).

The spelling of 13125440021535 in words is "thirteen trillion, one hundred twenty-five billion, four hundred forty million, twenty-one thousand, five hundred thirty-five".