165664493 has 2 divisors, whose sum is σ = 165664494. Its totient is φ = 165664492.

The previous prime is 165664463. The next prime is 165664531. The reversal of 165664493 is 394466561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163916809 + 1747684 = 12803^2 + 1322^2 .

It is an emirp because it is prime and its reverse (394466561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165664493 - 2¹⁰ = 165663469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165664463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82832246 + 82832247.

It is an arithmetic number, because the mean of its divisors is an integer number (82832247).

Almost surely, 2^165664493 is an apocalyptic number.

It is an amenable number.

165664493 is a deficient number, since it is larger than the sum of its proper divisors (1).

165664493 is an equidigital number, since it uses as much as digits as its factorization.

165664493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 165664493 is about 12871.0719444808. The cubic root of 165664493 is about 549.2159550228.

The spelling of 165664493 in words is "one hundred sixty-five million, six hundred sixty-four thousand, four hundred ninety-three".