998783999999 has 4 divisors (see below), whose sum is σ = 998875032936. Its totient is φ = 998692967064.

The previous prime is 998783999977. The next prime is 998784000001. The reversal of 998783999999 is 999999387899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998783999999 is a prime.

It is a Duffinian number.

998783999999 is a modest number, since divided by 999999 gives 998783 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998783999909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45500009 + ... + 45521954.

It is an arithmetic number, because the mean of its divisors is an integer number (249718758234).

Almost surely, 2^998783999999 is an apocalyptic number.

998783999999 is a deficient number, since it is larger than the sum of its proper divisors (91032937).

998783999999 is a wasteful number, since it uses less digits than its factorization.

998783999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91032936.

The product of its digits is 57854793024, while the sum is 98.

The spelling of 998783999999 in words is "nine hundred ninety-eight billion, seven hundred eighty-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".