164505161665 has 16 divisors (see below), whose sum is σ = 213161267088. Its totient is φ = 121155031296.

The previous prime is 164505161663. The next prime is 164505161699. The reversal of 164505161665 is 566161505461.

It can be written as a sum of positive squares in 8 ways, for example, as 9291224881 + 155213936784 = 96391^2 + 393972^2 .

It is not a de Polignac number, because 164505161665 - 2¹ = 164505161663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164505161663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3368314 + ... + 3416803.

It is an arithmetic number, because the mean of its divisors is an integer number (13322579193).

Almost surely, 2^164505161665 is an apocalyptic number.

It is an amenable number.

164505161665 is a deficient number, since it is larger than the sum of its proper divisors (48656105423).

164505161665 is a wasteful number, since it uses less digits than its factorization.

164505161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785508.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 164505161665 in words is "one hundred sixty-four billion, five hundred five million, one hundred sixty-one thousand, six hundred sixty-five".