998499505977 has 12 divisors (see below), whose sum is σ = 1504984762944. Its totient is φ = 636724322520.

The previous prime is 998499505961. The next prime is 998499505981. The reversal of 998499505977 is 779505994899.

998499505977 is a `hidden beast` number, since 9 + 9 + 8 + 499 + 5 + 0 + 59 + 77 = 666.

It is not a de Polignac number, because 998499505977 - 2⁴ = 998499505961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998499505896 and 998499505905.

It is not an unprimeable number, because it can be changed into a prime (998499505277) 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 11 ways as a sum of consecutive naturals, for example, 2411834349 + ... + 2411834762.

It is an arithmetic number, because the mean of its divisors is an integer number (125415396912).

Almost surely, 2^998499505977 is an apocalyptic number.

It is an amenable number.

998499505977 is a deficient number, since it is larger than the sum of its proper divisors (506485256967).

998499505977 is a wasteful number, since it uses less digits than its factorization.

998499505977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823669140 (or 4823669137 counting only the distinct ones).

The product of its (nonzero) digits is 2314720800, while the sum is 81.

The spelling of 998499505977 in words is "nine hundred ninety-eight billion, four hundred ninety-nine million, five hundred five thousand, nine hundred seventy-seven".