20565520551071 has 8 divisors (see below), whose sum is σ = 20813655460080. Its totient is φ = 20317394155392.

The previous prime is 20565520551053. The next prime is 20565520551151. The reversal of 20565520551071 is 17015502556502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20565520551071 - 2²² = 20565516356767 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 (20565520551041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2800631 + ... + 6998183.

It is an arithmetic number, because the mean of its divisors is an integer number (2601706932510).

Almost surely, 2^{20565520551071} is an apocalyptic number.

20565520551071 is a deficient number, since it is larger than the sum of its proper divisors (248134909009).

20565520551071 is an equidigital number, since it uses as much as digits as its factorization.

20565520551071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256665.

The product of its (nonzero) digits is 525000, while the sum is 44.

The spelling of 20565520551071 in words is "twenty trillion, five hundred sixty-five billion, five hundred twenty million, five hundred fifty-one thousand, seventy-one".