13505131216 has 10 divisors (see below), whose sum is σ = 26166191762. Its totient is φ = 6752565600.

The previous prime is 13505131207. The next prime is 13505131223. The reversal of 13505131216 is 61213150531.

It can be written as a sum of positive squares in only one way, i.e., 12342321216 + 1162810000 = 111096^2 + 34100^2 .

It is a super-2 number, since 2×13505131216² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422035335 + ... + 422035366.

Almost surely, 2^13505131216 is an apocalyptic number.

13505131216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13505131216 is a deficient number, since it is larger than the sum of its proper divisors (12661060546).

13505131216 is an equidigital number, since it uses as much as digits as its factorization.

13505131216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844070709 (or 844070703 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

Adding to 13505131216 its reverse (61213150531), we get a palindrome (74718281747).

The spelling of 13505131216 in words is "thirteen billion, five hundred five million, one hundred thirty-one thousand, two hundred sixteen".