164181065 has 4 divisors (see below), whose sum is σ = 197017284. Its totient is φ = 131344848.

The previous prime is 164181049. The next prime is 164181067. The reversal of 164181065 is 560181461.

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 19123129 + 145057936 = 4373^2 + 12044^2 .

It is a cyclic number.

It is not a de Polignac number, because 164181065 - 2⁴ = 164181049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164181067) 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, 16418102 + ... + 16418111.

It is an arithmetic number, because the mean of its divisors is an integer number (49254321).

Almost surely, 2^164181065 is an apocalyptic number.

It is an amenable number.

164181065 is a deficient number, since it is larger than the sum of its proper divisors (32836219).

164181065 is an equidigital number, since it uses as much as digits as its factorization.

164181065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32836218.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 164181065 is about 12813.3159252396. The cubic root of 164181065 is about 547.5717356989.

The spelling of 164181065 in words is "one hundred sixty-four million, one hundred eighty-one thousand, sixty-five".