164505443 has 4 divisors (see below), whose sum is σ = 165145800. Its totient is φ = 163865088.

The previous prime is 164505433. The next prime is 164505457. The reversal of 164505443 is 344505461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344505461 = 761 ⋅452701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164505443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164505403) 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, 319793 + ... + 320306.

It is an arithmetic number, because the mean of its divisors is an integer number (41286450).

Almost surely, 2^164505443 is an apocalyptic number.

164505443 is a deficient number, since it is larger than the sum of its proper divisors (640357).

164505443 is an equidigital number, since it uses as much as digits as its factorization.

164505443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640356.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 164505443 is about 12825.9675268574. The cubic root of 164505443 is about 547.9321170376.

The spelling of 164505443 in words is "one hundred sixty-four million, five hundred five thousand, four hundred forty-three".