13781191978226 has 8 divisors (see below), whose sum is σ = 20686843898604. Its totient is φ = 6885577345360.

The previous prime is 13781191978223. The next prime is 13781191978289. The reversal of 13781191978226 is 62287919118731.

13781191978226 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 2 ways, for example, as 13162057482025 + 619134496201 = 3627955^2 + 786851^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13781191978223) 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, 2509318445 + ... + 2509323936.

Almost surely, 2^{13781191978226} is an apocalyptic number.

13781191978226 is a deficient number, since it is larger than the sum of its proper divisors (6905651920378).

13781191978226 is a wasteful number, since it uses less digits than its factorization.

13781191978226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018643756.

The product of its digits is 18289152, while the sum is 65.

The spelling of 13781191978226 in words is "thirteen trillion, seven hundred eighty-one billion, one hundred ninety-one million, nine hundred seventy-eight thousand, two hundred twenty-six".