13520137433 has 6 divisors (see below), whose sum is σ = 14860977642. Its totient is φ = 12291033920.

The previous prime is 13520137391. The next prime is 13520137459. The reversal of 13520137433 is 33473102531.

It can be written as a sum of positive squares in only one way, i.e., 12179991769 + 1340145664 = 110363^2 + 36608^2 .

It is not a de Polignac number, because 13520137433 - 2⁶ = 13520137369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13520137433.

It is not an unprimeable number, because it can be changed into a prime (13520137493) 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, 55868216 + ... + 55868457.

It is an arithmetic number, because the mean of its divisors is an integer number (2476829607).

Almost surely, 2^13520137433 is an apocalyptic number.

It is an amenable number.

13520137433 is a deficient number, since it is larger than the sum of its proper divisors (1340840209).

13520137433 is a wasteful number, since it uses less digits than its factorization.

13520137433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111736695 (or 111736684 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 32.

Adding to 13520137433 its reverse (33473102531), we get a palindrome (46993239964).

The spelling of 13520137433 in words is "thirteen billion, five hundred twenty million, one hundred thirty-seven thousand, four hundred thirty-three".