997766555667799 has 2 divisors, whose sum is σ = 997766555667800. Its totient is φ = 997766555667798.

The previous prime is 997766555667793. The next prime is 997766555667811.

It is a happy number.

997766555667799 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 997766555667799 - 2³¹ = 997764408184151 is a prime.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 997766555667698 and 997766555667707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997766555667793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498883277833899 + 498883277833900.

It is an arithmetic number, because the mean of its divisors is an integer number (498883277833900).

Almost surely, 2^{997766555667799} is an apocalyptic number.

997766555667799 is a deficient number, since it is larger than the sum of its proper divisors (1).

997766555667799 is an equidigital number, since it uses as much as digits as its factorization.

997766555667799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2551979682000, while the sum is 103.

The spelling of 997766555667799 in words is "nine hundred ninety-seven trillion, seven hundred sixty-six billion, five hundred fifty-five million, six hundred sixty-seven thousand, seven hundred ninety-nine".