13067557781 has 6 divisors (see below), whose sum is σ = 13791522582. Its totient is φ = 12379791240.

The previous prime is 13067557753. The next prime is 13067557873. The reversal of 13067557781 is 18775576031.

13067557781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12935422756 + 132135025 = 113734^2 + 11495^2 .

It is not a de Polignac number, because 13067557781 - 2¹⁰ = 13067556757 is a prime.

It is a super-2 number, since 2×13067557781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13067557381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18098750 + ... + 18099471.

It is an arithmetic number, because the mean of its divisors is an integer number (2298587097).

Almost surely, 2^13067557781 is an apocalyptic number.

It is an amenable number.

13067557781 is a deficient number, since it is larger than the sum of its proper divisors (723964801).

13067557781 is an equidigital number, since it uses as much as digits as its factorization.

13067557781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36198259 (or 36198240 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 50.

The spelling of 13067557781 in words is "thirteen billion, sixty-seven million, five hundred fifty-seven thousand, seven hundred eighty-one".