997799888997799 has 2 divisors, whose sum is σ = 997799888997800. Its totient is φ = 997799888997798.

The previous prime is 997799888997763. The next prime is 997799888997979.

997799888997799 is nontrivially palindromic in base 10.

Together with next prime (997799888997979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 997799888997799 - 2⁹ = 997799888997287 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997799888997719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498899944498899 + 498899944498900.

It is an arithmetic number, because the mean of its divisors is an integer number (498899944498900).

Almost surely, 2^{997799888997799} is an apocalyptic number.

997799888997799 is a deficient number, since it is larger than the sum of its proper divisors (1).

997799888997799 is an equidigital number, since it uses as much as digits as its factorization.

997799888997799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52917850685952, while the sum is 124.

The spelling of 997799888997799 in words is "nine hundred ninety-seven trillion, seven hundred ninety-nine billion, eight hundred eighty-eight million, nine hundred ninety-seven thousand, seven hundred ninety-nine".