997799444997799 has 2 divisors, whose sum is σ = 997799444997800. Its totient is φ = 997799444997798.

The previous prime is 997799444997767. The next prime is 997799444997863.

997799444997799 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 997799444997799 - 2⁵ = 997799444997767 is a prime.

It is a super-2 number, since 2×997799444997799² (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 (997799444997709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498899722498899 + 498899722498900.

It is an arithmetic number, because the mean of its divisors is an integer number (498899722498900).

Almost surely, 2^{997799444997799} is an apocalyptic number.

997799444997799 is a deficient number, since it is larger than the sum of its proper divisors (1).

997799444997799 is an equidigital number, since it uses as much as digits as its factorization.

997799444997799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6614731335744, while the sum is 112.

The spelling of 997799444997799 in words is "nine hundred ninety-seven trillion, seven hundred ninety-nine billion, four hundred forty-four million, nine hundred ninety-seven thousand, seven hundred ninety-nine".