99999001000 has 64 divisors (see below), whose sum is σ = 234384583680. Its totient is φ = 39933460800.

The previous prime is 99999000979. The next prime is 99999001007. The reversal of 99999001000 is 10099999.

It is not an unprimeable number, because it can be changed into a prime (99999001007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524629 + ... + 689371.

It is an arithmetic number, because the mean of its divisors is an integer number (3662259120).

Almost surely, 2^99999001000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117192291840).

99999001000 is an abundant number, since it is smaller than the sum of its proper divisors (134385582680).

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

99999001000 is a wasteful number, since it uses less digits than its factorization.

99999001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165371 (or 165357 counting only the distinct ones).

The product of its (nonzero) digits is 59049, while the sum is 46.

The spelling of 99999001000 in words is "ninety-nine billion, nine hundred ninety-nine million, one thousand".