20868160165 has 4 divisors (see below), whose sum is σ = 25041792204. Its totient is φ = 16694528128.

The previous prime is 20868160139. The next prime is 20868160171. The reversal of 20868160165 is 56106186802.

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 3792465889 + 17075694276 = 61583^2 + 130674^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868160165 - 2¹¹ = 20868158117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086816012 + ... + 2086816021.

It is an arithmetic number, because the mean of its divisors is an integer number (6260448051).

Almost surely, 2^20868160165 is an apocalyptic number.

It is an amenable number.

20868160165 is a deficient number, since it is larger than the sum of its proper divisors (4173632039).

20868160165 is an equidigital number, since it uses as much as digits as its factorization.

20868160165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173632038.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 20868160165 in words is "twenty billion, eight hundred sixty-eight million, one hundred sixty thousand, one hundred sixty-five".