20217565606711 has 4 divisors (see below), whose sum is σ = 22055526116424. Its totient is φ = 18379605097000.

The previous prime is 20217565606699. The next prime is 20217565606753. The reversal of 20217565606711 is 11760656571202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20217565606711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217565601711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918980254840 + ... + 918980254861.

It is an arithmetic number, because the mean of its divisors is an integer number (5513881529106).

Almost surely, 2^{20217565606711} is an apocalyptic number.

20217565606711 is a deficient number, since it is larger than the sum of its proper divisors (1837960509713).

20217565606711 is a wasteful number, since it uses less digits than its factorization.

20217565606711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837960509712.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 20217565606711 in words is "twenty trillion, two hundred seventeen billion, five hundred sixty-five million, six hundred six thousand, seven hundred eleven".