164138218 has 4 divisors (see below), whose sum is σ = 246207330. Its totient is φ = 82069108.

The previous prime is 164138203. The next prime is 164138239. The reversal of 164138218 is 812831461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812831461 = 13 ⋅62525497.

It can be written as a sum of positive squares in only one way, i.e., 90573289 + 73564929 = 9517^2 + 8577^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41034553 + ... + 41034556.

Almost surely, 2^164138218 is an apocalyptic number.

164138218 is a deficient number, since it is larger than the sum of its proper divisors (82069112).

164138218 is an equidigital number, since it uses as much as digits as its factorization.

164138218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82069111.

The product of its digits is 9216, while the sum is 34.

The square root of 164138218 is about 12811.6438445658. The cubic root of 164138218 is about 547.5240975473.

Adding to 164138218 its reverse (812831461), we get a palindrome (976969679).

The spelling of 164138218 in words is "one hundred sixty-four million, one hundred thirty-eight thousand, two hundred eighteen".