20117520662251 has 2 divisors, whose sum is σ = 20117520662252. Its totient is φ = 20117520662250.

The previous prime is 20117520662209. The next prime is 20117520662287. The reversal of 20117520662251 is 15226602571102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20117520662251 - 2⁹ = 20117520661739 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, 10058760331125 + 10058760331126.

It is an arithmetic number, because the mean of its divisors is an integer number (10058760331126).

Almost surely, 2^{20117520662251} is an apocalyptic number.

20117520662251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117520662251 is an equidigital number, since it uses as much as digits as its factorization.

20117520662251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 20117520662251 in words is "twenty trillion, one hundred seventeen billion, five hundred twenty million, six hundred sixty-two thousand, two hundred fifty-one".