20162170081 has 4 divisors (see below), whose sum is σ = 20162893572. Its totient is φ = 20161446592.

The previous prime is 20162170057. The next prime is 20162170099. The reversal of 20162170081 is 18007126102.

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 9142419456 + 11019750625 = 95616^2 + 104975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20162170081 - 2¹⁵ = 20162137313 is a prime.

It is a super-2 number, since 2×20162170081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20162170981) 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, 318196 + ... + 376261.

It is an arithmetic number, because the mean of its divisors is an integer number (5040723393).

Almost surely, 2^20162170081 is an apocalyptic number.

It is an amenable number.

20162170081 is a deficient number, since it is larger than the sum of its proper divisors (723491).

20162170081 is an equidigital number, since it uses as much as digits as its factorization.

20162170081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723490.

The product of its (nonzero) digits is 1344, while the sum is 28.

Adding to 20162170081 its reverse (18007126102), we get a palindrome (38169296183).

The spelling of 20162170081 in words is "twenty billion, one hundred sixty-two million, one hundred seventy thousand, eighty-one".