999990100000 has 72 divisors (see below), whose sum is σ = 2460755884356. Its totient is φ = 399996000000.

The previous prime is 999990099973. The next prime is 999990100001. The reversal of 999990100000 is 1099999.

It can be written as a sum of positive squares in 6 ways, for example, as 102627966736 + 897362133264 = 320356^2 + 947292^2 .

It is not an unprimeable number, because it can be changed into a prime (999990100001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4899951 + ... + 5099950.

Almost surely, 2^999990100000 is an apocalyptic number.

It is an amenable number.

999990100000 is an abundant number, since it is smaller than the sum of its proper divisors (1460765784356).

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

999990100000 is an frugal number, since it uses more digits than its factorization.

999990100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999936 (or 9999908 counting only the distinct ones).

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

Adding to 999990100000 its reverse (1099999), we get a palindrome (999991199999).

The spelling of 999990100000 in words is "nine hundred ninety-nine billion, nine hundred ninety million, one hundred thousand".