80000000001 has 42 divisors (see below), whose sum is σ = 127416096822. Its totient is φ = 50195946240.

The previous prime is 79999999999. The next prime is 80000000021. The reversal of 80000000001 is 10000000008.

It can be written as a sum of positive squares in 3 ways, for example, as 52980530625 + 27019469376 = 230175^2 + 164376^2 .

It is not a de Polignac number, because 80000000001 - 2¹ = 79999999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80000000021) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 20821 + ... + 400541.

It is an arithmetic number, because the mean of its divisors is an integer number (3033716591).

Almost surely, 2^80000000001 is an apocalyptic number.

80000000001 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

80000000001 is a deficient number, since it is larger than the sum of its proper divisors (47416096821).

80000000001 is an equidigital number, since it uses as much as digits as its factorization.

80000000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379773 (or 379741 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 80000000001 its reverse (10000000008), we get a palindrome (90000000009).

The spelling of 80000000001 in words is "eighty billion, one", and thus it is an aban number and an uban number.