13444556778 has 12 divisors (see below), whose sum is σ = 29129873058. Its totient is φ = 4481518920.

The previous prime is 13444556729. The next prime is 13444556843. The reversal of 13444556778 is 87765544431.

13444556778 is a `hidden beast` number, since 1 + 3 + 4 + 4 + 4 + 5 + 567 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6975089289 + 6469467489 = 83517^2 + 80433^2 .

It is a super-2 number, since 2×13444556778² (a number of 21 digits) contains 22 as substring.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 373459893 + ... + 373459928.

Almost surely, 2^13444556778 is an apocalyptic number.

13444556778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13444556778 is an abundant number, since it is smaller than the sum of its proper divisors (15685316280).

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

13444556778 is a wasteful number, since it uses less digits than its factorization.

13444556778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746919829 (or 746919826 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 13444556778 in words is "thirteen billion, four hundred forty-four million, five hundred fifty-six thousand, seven hundred seventy-eight".