17999820101 has 2 divisors, whose sum is σ = 17999820102. Its totient is φ = 17999820100.

The previous prime is 17999820089. The next prime is 17999820131. The reversal of 17999820101 is 10102899971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9949065025 + 8050755076 = 99745^2 + 89726^2 .

It is a cyclic number.

It is not a de Polignac number, because 17999820101 - 2¹⁰ = 17999819077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17999820131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8999910050 + 8999910051.

It is an arithmetic number, because the mean of its divisors is an integer number (8999910051).

Almost surely, 2^17999820101 is an apocalyptic number.

It is an amenable number.

17999820101 is a deficient number, since it is larger than the sum of its proper divisors (1).

17999820101 is an equidigital number, since it uses as much as digits as its factorization.

17999820101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 47.

The spelling of 17999820101 in words is "seventeen billion, nine hundred ninety-nine million, eight hundred twenty thousand, one hundred one".