99999998550 has 96 divisors (see below), whose sum is σ = 277538486400. Its totient is φ = 26474770080.

The previous prime is 99999998513. The next prime is 99999998573. The reversal of 99999998550 is 5589999999.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999998550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78804 + ... + 454103.

It is an arithmetic number, because the mean of its divisors is an integer number (2891025900).

Almost surely, 2^99999998550 is an apocalyptic number.

99999998550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99999998550 is an abundant number, since it is smaller than the sum of its proper divisors (177538487850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999998550 is a wasteful number, since it uses less digits than its factorization.

99999998550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533067 (or 533056 counting only the distinct ones).

The product of its (nonzero) digits is 956593800, while the sum is 81.

The spelling of 99999998550 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred fifty".