997799997799 has 16 divisors (see below), whose sum is σ = 1099409554080. Its totient is φ = 898009200000.

The previous prime is 997799997797. The next prime is 997799997851.

997799997799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 997799997799 - 2¹ = 997799997797 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997799997797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10954657 + ... + 11045365.

It is an arithmetic number, because the mean of its divisors is an integer number (68713097130).

Almost surely, 2^997799997799 is an apocalyptic number.

997799997799 is a deficient number, since it is larger than the sum of its proper divisors (101609556281).

997799997799 is a wasteful number, since it uses less digits than its factorization.

997799997799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100722.

The product of its digits is 103355177121, while the sum is 100.

The spelling of 997799997799 in words is "nine hundred ninety-seven billion, seven hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred ninety-nine".