1178222118781 has 4 divisors (see below), whose sum is σ = 1178238804732. Its totient is φ = 1178205432832.

The previous prime is 1178222118779. The next prime is 1178222118811. The reversal of 1178222118781 is 1878112228711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 235750062681 + 942472056100 = 485541^2 + 970810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178222118781 - 2¹ = 1178222118779 is a prime.

It is a super-2 number, since 2×1178222118781² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178222158781) 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, 8236606 + ... + 8378431.

It is an arithmetic number, because the mean of its divisors is an integer number (294559701183).

Almost surely, 2^{1178222118781} is an apocalyptic number.

It is an amenable number.

1178222118781 is a deficient number, since it is larger than the sum of its proper divisors (16685951).

1178222118781 is an equidigital number, since it uses as much as digits as its factorization.

1178222118781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16685950.

The product of its digits is 200704, while the sum is 49.

The spelling of 1178222118781 in words is "one trillion, one hundred seventy-eight billion, two hundred twenty-two million, one hundred eighteen thousand, seven hundred eighty-one".