8438166794401 has 4 divisors (see below), whose sum is σ = 8438176442500. Its totient is φ = 8438157146304.

The previous prime is 8438166794399. The next prime is 8438166794437. The reversal of 8438166794401 is 1044976618348.

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 3763386603025 + 4674780191376 = 1939945^2 + 2162124^2 .

It is a cyclic number.

It is not a de Polignac number, because 8438166794401 - 2¹ = 8438166794399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8438166794401.

It is not an unprimeable number, because it can be changed into a prime (8438166794461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365076 + ... + 5310373.

It is an arithmetic number, because the mean of its divisors is an integer number (2109544110625).

Almost surely, 2^{8438166794401} is an apocalyptic number.

It is an amenable number.

8438166794401 is a deficient number, since it is larger than the sum of its proper divisors (9648099).

8438166794401 is an equidigital number, since it uses as much as digits as its factorization.

8438166794401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9648098.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 8438166794401 in words is "eight trillion, four hundred thirty-eight billion, one hundred sixty-six million, seven hundred ninety-four thousand, four hundred one".