13268231781 has 16 divisors (see below), whose sum is σ = 20219954304. Its totient is φ = 7581210624.

The previous prime is 13268231771. The next prime is 13268231803. The reversal of 13268231781 is 18713286231.

13268231781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13268231781 - 2⁵ = 13268231749 is a prime.

It is a super-2 number, since 2×13268231781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13268231761) 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 15 ways as a sum of consecutive naturals, for example, 362581 + ... + 397493.

It is an arithmetic number, because the mean of its divisors is an integer number (1263747144).

Almost surely, 2^13268231781 is an apocalyptic number.

It is an amenable number.

13268231781 is a deficient number, since it is larger than the sum of its proper divisors (6951722523).

13268231781 is a wasteful number, since it uses less digits than its factorization.

13268231781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53020.

The product of its digits is 96768, while the sum is 42.

The spelling of 13268231781 in words is "thirteen billion, two hundred sixty-eight million, two hundred thirty-one thousand, seven hundred eighty-one".