997998899799 has 16 divisors (see below), whose sum is σ = 1514749319424. Its totient is φ = 578550086400.

The previous prime is 997998899791. The next prime is 997998899837.

It is a happy number.

997998899799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 997998899799 - 2³ = 997998899791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997998899791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657442522 + ... + 657444039.

It is an arithmetic number, because the mean of its divisors is an integer number (94671832464).

Almost surely, 2^997998899799 is an apocalyptic number.

997998899799 is a deficient number, since it is larger than the sum of its proper divisors (516750419625).

997998899799 is a wasteful number, since it uses less digits than its factorization.

997998899799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314886598.

The product of its digits is 134994517056, while the sum is 102.

The spelling of 997998899799 in words is "nine hundred ninety-seven billion, nine hundred ninety-eight million, eight hundred ninety-nine thousand, seven hundred ninety-nine".