99138505000 has 40 divisors (see below), whose sum is σ = 232281528930. Its totient is φ = 39655400000.

The previous prime is 99138504947. The next prime is 99138505003. The reversal of 99138505000 is 50583199.

It can be written as a sum of positive squares in 5 ways, for example, as 7628624964 + 91509880036 = 87342^2 + 302506^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (99138505003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9908851 + ... + 9918850.

Almost surely, 2^99138505000 is an apocalyptic number.

It is an amenable number.

99138505000 is an abundant number, since it is smaller than the sum of its proper divisors (133143023930).

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

99138505000 is a wasteful number, since it uses less digits than its factorization.

99138505000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19827727 (or 19827708 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 99138505000 in words is "ninety-nine billion, one hundred thirty-eight million, five hundred five thousand".