164206643 has 2 divisors, whose sum is σ = 164206644. Its totient is φ = 164206642.

The previous prime is 164206631. The next prime is 164206649. The reversal of 164206643 is 346602461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164206643 - 2⁸ = 164206387 is a prime.

It is not a weakly prime, because it can be changed into another prime (164206649) by changing a digit.

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, 82103321 + 82103322.

It is an arithmetic number, because the mean of its divisors is an integer number (82103322).

Almost surely, 2^164206643 is an apocalyptic number.

164206643 is a deficient number, since it is larger than the sum of its proper divisors (1).

164206643 is an equidigital number, since it uses as much as digits as its factorization.

164206643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 164206643 is about 12814.3139886613. The cubic root of 164206643 is about 547.6001698804.

The spelling of 164206643 in words is "one hundred sixty-four million, two hundred six thousand, six hundred forty-three".