20055365161 has 4 divisors (see below), whose sum is σ = 21598085572. Its totient is φ = 18512644752.

The previous prime is 20055365107. The next prime is 20055365191. The reversal of 20055365161 is 16156355002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3396558400 + 16658806761 = 58280^2 + 129069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20055365161 - 2⁹ = 20055364649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20055365191) 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, 771360186 + ... + 771360211.

It is an arithmetic number, because the mean of its divisors is an integer number (5399521393).

Almost surely, 2^20055365161 is an apocalyptic number.

It is an amenable number.

20055365161 is a deficient number, since it is larger than the sum of its proper divisors (1542720411).

20055365161 is a wasteful number, since it uses less digits than its factorization.

20055365161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542720410.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 20055365161 in words is "twenty billion, fifty-five million, three hundred sixty-five thousand, one hundred sixty-one".