7844223994066 has 8 divisors (see below), whose sum is σ = 12172071715020. Its totient is φ = 3786866755728.

The previous prime is 7844223994007. The next prime is 7844223994067. The reversal of 7844223994066 is 6604993224487.

It can be written as a sum of positive squares in 2 ways, for example, as 7390650030625 + 453573963441 = 2718575^2 + 673479^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 7844223993989 and 7844223994007.

It is not an unprimeable number, because it can be changed into a prime (7844223994067) 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, 67622620581 + ... + 67622620696.

Almost surely, 2^{7844223994066} is an apocalyptic number.

7844223994066 is a deficient number, since it is larger than the sum of its proper divisors (4327847720954).

7844223994066 is a wasteful number, since it uses less digits than its factorization.

7844223994066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135245241308.

The product of its (nonzero) digits is 125411328, while the sum is 64.

The spelling of 7844223994066 in words is "seven trillion, eight hundred forty-four billion, two hundred twenty-three million, nine hundred ninety-four thousand, sixty-six".