13781443194 has 56 divisors (see below), whose sum is σ = 31456889760. Its totient is φ = 4525217928.

The previous prime is 13781443187. The next prime is 13781443211. The reversal of 13781443194 is 49134418731.

It is a happy number.

13781443194 is a `hidden beast` number, since 13 + 7 + 8 + 1 + 443 + 194 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 27147 + ... + 168225.

Almost surely, 2^13781443194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13781443194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15728444880).

13781443194 is an abundant number, since it is smaller than the sum of its proper divisors (17675446566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13781443194 is an equidigital number, since it uses as much as digits as its factorization.

13781443194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141166 (or 141151 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 13781443194 in words is "thirteen billion, seven hundred eighty-one million, four hundred forty-three thousand, one hundred ninety-four".