1001117785777 has 2 divisors, whose sum is σ = 1001117785778. Its totient is φ = 1001117785776.

The previous prime is 1001117785771. The next prime is 1001117785781. The reversal of 1001117785777 is 7775877111001.

It is a happy number.

1001117785777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930682748961 + 70435036816 = 964719^2 + 265396^2 .

It is an emirp because it is prime and its reverse (7775877111001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001117785777 - 2²⁷ = 1000983568049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001117785771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500558892888 + 500558892889.

It is an arithmetic number, because the mean of its divisors is an integer number (500558892889).

Almost surely, 2^{1001117785777} is an apocalyptic number.

It is an amenable number.

1001117785777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001117785777 is an equidigital number, since it uses as much as digits as its factorization.

1001117785777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672280, while the sum is 52.

The spelling of 1001117785777 in words is "one trillion, one billion, one hundred seventeen million, seven hundred eighty-five thousand, seven hundred seventy-seven".