20117520662209 has 2 divisors, whose sum is σ = 20117520662210. Its totient is φ = 20117520662208.

The previous prime is 20117520662201. The next prime is 20117520662251. The reversal of 20117520662209 is 90226602571102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14148919865025 + 5968600797184 = 3761505^2 + 2443072^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117520662209 - 2³ = 20117520662201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117520662201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058760331104 + 10058760331105.

It is an arithmetic number, because the mean of its divisors is an integer number (10058760331105).

Almost surely, 2^{20117520662209} is an apocalyptic number.

It is an amenable number.

20117520662209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117520662209 is an equidigital number, since it uses as much as digits as its factorization.

20117520662209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 20117520662209 in words is "twenty trillion, one hundred seventeen billion, five hundred twenty million, six hundred sixty-two thousand, two hundred nine".