13500320081 has 2 divisors, whose sum is σ = 13500320082. Its totient is φ = 13500320080.

The previous prime is 13500320047. The next prime is 13500320087. The reversal of 13500320081 is 18002300531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13072492225 + 427827856 = 114335^2 + 20684^2 .

It is a cyclic number.

It is not a de Polignac number, because 13500320081 - 2⁶ = 13500320017 is a prime.

It is a super-2 number, since 2×13500320081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13500320087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6750160040 + 6750160041.

It is an arithmetic number, because the mean of its divisors is an integer number (6750160041).

Almost surely, 2^13500320081 is an apocalyptic number.

It is an amenable number.

13500320081 is a deficient number, since it is larger than the sum of its proper divisors (1).

13500320081 is an equidigital number, since it uses as much as digits as its factorization.

13500320081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 13500320081 in words is "thirteen billion, five hundred million, three hundred twenty thousand, eighty-one".