20184958699909 has 2 divisors, whose sum is σ = 20184958699910. Its totient is φ = 20184958699908.

The previous prime is 20184958699883. The next prime is 20184958699949. The reversal of 20184958699909 is 90999685948102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20049994309284 + 134964390625 = 4477722^2 + 367375^2 .

It is a cyclic number.

It is not a de Polignac number, because 20184958699909 - 2⁷ = 20184958699781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20184958699949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092479349954 + 10092479349955.

It is an arithmetic number, because the mean of its divisors is an integer number (10092479349955).

Almost surely, 2^{20184958699909} is an apocalyptic number.

It is an amenable number.

20184958699909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20184958699909 is an equidigital number, since it uses as much as digits as its factorization.

20184958699909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 906992640, while the sum is 79.

The spelling of 20184958699909 in words is "twenty trillion, one hundred eighty-four billion, nine hundred fifty-eight million, six hundred ninety-nine thousand, nine hundred nine".