20117635677647 has 2 divisors, whose sum is σ = 20117635677648. Its totient is φ = 20117635677646.

The previous prime is 20117635677637. The next prime is 20117635677709. The reversal of 20117635677647 is 74677653671102.

It is an a-pointer prime, because the next prime (20117635677709) can be obtained adding 20117635677647 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20117635677647 - 2²² = 20117631483343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20117635677647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20117635677637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058817838823 + 10058817838824.

It is an arithmetic number, because the mean of its divisors is an integer number (10058817838824).

Almost surely, 2^{20117635677647} is an apocalyptic number.

20117635677647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117635677647 is an equidigital number, since it uses as much as digits as its factorization.

20117635677647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62233920, while the sum is 62.

The spelling of 20117635677647 in words is "twenty trillion, one hundred seventeen billion, six hundred thirty-five million, six hundred seventy-seven thousand, six hundred forty-seven".