164565647 has 4 divisors (see below), whose sum is σ = 164596440. Its totient is φ = 164534856.

The previous prime is 164565607. The next prime is 164565671. The reversal of 164565647 is 746565461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746565461 = 19 ⋅39292919.

It is a cyclic number.

It is not a de Polignac number, because 164565647 - 2¹⁴ = 164549263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164565598 and 164565607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164565607) 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, 5072 + ... + 18837.

It is an arithmetic number, because the mean of its divisors is an integer number (41149110).

Almost surely, 2^164565647 is an apocalyptic number.

164565647 is a deficient number, since it is larger than the sum of its proper divisors (30793).

164565647 is an equidigital number, since it uses as much as digits as its factorization.

164565647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30792.

The product of its digits is 604800, while the sum is 44.

The square root of 164565647 is about 12828.3142696147. The cubic root of 164565647 is about 547.9989510609.

The spelling of 164565647 in words is "one hundred sixty-four million, five hundred sixty-five thousand, six hundred forty-seven".