99999998819 has 8 divisors (see below), whose sum is σ = 114288542208. Its totient is φ = 85712162760.

The previous prime is 99999998767. The next prime is 99999998821. The reversal of 99999998819 is 91889999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-99999998819 is a prime.

It is a super-2 number, since 2×99999998819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999997819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172004 + ... + 479150.

It is an arithmetic number, because the mean of its divisors is an integer number (14286067776).

Almost surely, 2^99999998819 is an apocalyptic number.

99999998819 is a deficient number, since it is larger than the sum of its proper divisors (14288543389).

99999998819 is a wasteful number, since it uses less digits than its factorization.

99999998819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353665.

The product of its digits is 2754990144, while the sum is 89.

The spelling of 99999998819 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred nineteen".