7994581247777 has 16 divisors (see below), whose sum is σ = 8092694610000. Its totient is φ = 7896656317440.

The previous prime is 7994581247773. The next prime is 7994581247791. The reversal of 7994581247777 is 7777421854997.

It can be written as a sum of positive squares in 8 ways, for example, as 1387851281041 + 6606729966736 = 1178071^2 + 2570356^2 .

It is a cyclic number.

It is not a de Polignac number, because 7994581247777 - 2² = 7994581247773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7994581247698 and 7994581247707.

It is not an unprimeable number, because it can be changed into a prime (7994581247773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400500077 + ... + 400520037.

It is an arithmetic number, because the mean of its divisors is an integer number (505793413125).

Almost surely, 2^{7994581247777} is an apocalyptic number.

It is an amenable number.

7994581247777 is a deficient number, since it is larger than the sum of its proper divisors (98113362223).

7994581247777 is a wasteful number, since it uses less digits than its factorization.

7994581247777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24436.

The product of its digits is 1742549760, while the sum is 77.

The spelling of 7994581247777 in words is "seven trillion, nine hundred ninety-four billion, five hundred eighty-one million, two hundred forty-seven thousand, seven hundred seventy-seven".