99919980999 has 72 divisors (see below), whose sum is σ = 155274871920. Its totient is φ = 63458505216.

The previous prime is 99919980967. The next prime is 99919981111. The reversal of 99919980999 is 99908991999.

It is not a de Polignac number, because 99919980999 - 2⁵ = 99919980967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99919980899) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 729342859 + ... + 729342995.

Almost surely, 2^99919980999 is an apocalyptic number.

99919980999 is a deficient number, since it is larger than the sum of its proper divisors (55354890921).

99919980999 is an equidigital number, since it uses as much as digits as its factorization.

99919980999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 344373768, while the sum is 81.

The spelling of 99919980999 in words is "ninety-nine billion, nine hundred nineteen million, nine hundred eighty thousand, nine hundred ninety-nine".