99999980000001 has 45 divisors (see below), whose sum is σ = 150042607696531. Its totient is φ = 66373433362656.

The previous prime is 99999979999987. The next prime is 99999980000009. The reversal of 99999980000001 is 10000008999999.

The square root of 99999980000001 is 9999999.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 97860547217601 + 2139432782400 = 9892449^2 + 1462680^2 .

It is not a de Polignac number, because 99999980000001 - 2⁷ = 99999979999873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99999980000009) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 21509995525 + ... + 21510000173.

Almost surely, 2^{99999980000001} is an apocalyptic number.

99999980000001 is the 9999999-th square number.

99999980000001 is the 5000000-th centered octagonal number.

It is an amenable number.

99999980000001 is a deficient number, since it is larger than the sum of its proper divisors (50042627696530).

99999980000001 is an frugal number, since it uses more digits than its factorization.

99999980000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9788 (or 4891 counting only the distinct ones).

The product of its (nonzero) digits is 4251528, while the sum is 63.

It can be divided in two parts, 999999 and 80000001, that added together give a square (81000000 = 9000²).

The spelling of 99999980000001 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty million, one", and thus it is an aban number.