164218511 has 2 divisors, whose sum is σ = 164218512. Its totient is φ = 164218510.

The previous prime is 164218441. The next prime is 164218513. The reversal of 164218511 is 115812461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164218511 - 2¹⁸ = 163956367 is a prime.

It is a Sophie Germain prime.

Together with 164218513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164218513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82109255 + 82109256.

It is an arithmetic number, because the mean of its divisors is an integer number (82109256).

Almost surely, 2^164218511 is an apocalyptic number.

164218511 is a deficient number, since it is larger than the sum of its proper divisors (1).

164218511 is an equidigital number, since it uses as much as digits as its factorization.

164218511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 164218511 is about 12814.7770561957. Note that the first 3 decimals coincide. The cubic root of 164218511 is about 547.6133621243.

The spelling of 164218511 in words is "one hundred sixty-four million, two hundred eighteen thousand, five hundred eleven".