13220315614537 has 4 divisors (see below), whose sum is σ = 13262020080516. Its totient is φ = 13178611148560.

The previous prime is 13220315614507. The next prime is 13220315614607. The reversal of 13220315614537 is 73541651302231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2848334665401 + 10371980949136 = 1687701^2 + 3220556^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220315614537 - 2²⁷ = 13220181396809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220315614493 and 13220315614502.

It is not an unprimeable number, because it can be changed into a prime (13220315614507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20852232514 + ... + 20852233147.

It is an arithmetic number, because the mean of its divisors is an integer number (3315505020129).

Almost surely, 2^{13220315614537} is an apocalyptic number.

It is an amenable number.

13220315614537 is a deficient number, since it is larger than the sum of its proper divisors (41704465979).

13220315614537 is an equidigital number, since it uses as much as digits as its factorization.

13220315614537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41704465978.

The product of its (nonzero) digits is 453600, while the sum is 43.

Adding to 13220315614537 its reverse (73541651302231), we get a palindrome (86761966916768).

The spelling of 13220315614537 in words is "thirteen trillion, two hundred twenty billion, three hundred fifteen million, six hundred fourteen thousand, five hundred thirty-seven".