997777999777799 has 2 divisors, whose sum is σ = 997777999777800. Its totient is φ = 997777999777798.

The previous prime is 997777999777789. The next prime is 997777999777841.

997777999777799 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 997777999777799 - 2³² = 997773704810503 is a prime.

It is a super-2 number, since 2×997777999777799² (a number of 31 digits) contains 22 as substring.

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 (997777999777789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498888999888899 + 498888999888900.

It is an arithmetic number, because the mean of its divisors is an integer number (498888999888900).

Almost surely, 2^{997777999777799} is an apocalyptic number.

997777999777799 is a deficient number, since it is larger than the sum of its proper divisors (1).

997777999777799 is an equidigital number, since it uses as much as digits as its factorization.

997777999777799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27572864474169, while the sum is 119.

The spelling of 997777999777799 in words is "nine hundred ninety-seven trillion, seven hundred seventy-seven billion, nine hundred ninety-nine million, seven hundred seventy-seven thousand, seven hundred ninety-nine".