998848331777 has 4 divisors (see below), whose sum is σ = 999132341076. Its totient is φ = 998564322480.

The previous prime is 998848331749. The next prime is 998848331779. The reversal of 998848331777 is 777133848899.

It is a happy number.

It is a Cunningham number, because it is equal to 999424²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 958370513296 + 40477818481 = 978964^2 + 201191^2 .

It is a cyclic number.

It is not a de Polignac number, because 998848331777 - 2¹² = 998848327681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998848331779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141999374 + ... + 142006407.

It is an arithmetic number, because the mean of its divisors is an integer number (249783085269).

It is a Proth number, since it is equal to 3721 ⋅ 2²⁸ + 1 and 3721 < 2²⁸.

Almost surely, 2^998848331777 is an apocalyptic number.

It is an amenable number.

998848331777 is a deficient number, since it is larger than the sum of its proper divisors (284009299).

998848331777 is a wasteful number, since it uses less digits than its factorization.

998848331777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284009298.

The product of its digits is 512096256, while the sum is 74.

The spelling of 998848331777 in words is "nine hundred ninety-eight billion, eight hundred forty-eight million, three hundred thirty-one thousand, seven hundred seventy-seven".