164636849 has 4 divisors (see below), whose sum is σ = 177301236. Its totient is φ = 151972464.

The previous prime is 164636837. The next prime is 164636863. The reversal of 164636849 is 948636461.

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 52128400 + 112508449 = 7220^2 + 10607^2 .

It is a cyclic number.

It is not a de Polignac number, because 164636849 - 2²⁴ = 147859633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164666849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6332174 + ... + 6332199.

It is an arithmetic number, because the mean of its divisors is an integer number (44325309).

Almost surely, 2^164636849 is an apocalyptic number.

It is an amenable number.

164636849 is a deficient number, since it is larger than the sum of its proper divisors (12664387).

164636849 is a wasteful number, since it uses less digits than its factorization.

164636849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12664386.

The product of its digits is 746496, while the sum is 47.

The square root of 164636849 is about 12831.0891587581. The cubic root of 164636849 is about 548.0779732141.

The spelling of 164636849 in words is "one hundred sixty-four million, six hundred thirty-six thousand, eight hundred forty-nine".