20117102565566 has 4 divisors (see below), whose sum is σ = 30175653848352. Its totient is φ = 10058551282782.

The previous prime is 20117102565559. The next prime is 20117102565641. The reversal of 20117102565566 is 66556520171102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20117102565566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5029275641390 + ... + 5029275641393.

It is an arithmetic number, because the mean of its divisors is an integer number (7543913462088).

Almost surely, 2^{20117102565566} is an apocalyptic number.

20117102565566 is a deficient number, since it is larger than the sum of its proper divisors (10058551282786).

20117102565566 is a wasteful number, since it uses less digits than its factorization.

20117102565566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058551282785.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 20117102565566 in words is "twenty trillion, one hundred seventeen billion, one hundred two million, five hundred sixty-five thousand, five hundred sixty-six".