165666810293 has 4 divisors (see below), whose sum is σ = 165668588748. Its totient is φ = 165665031840.

The previous prime is 165666810259. The next prime is 165666810343. The reversal of 165666810293 is 392018666561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113233596004 + 52433214289 = 336502^2 + 228983^2 .

It is a cyclic number.

It is not a de Polignac number, because 165666810293 - 2⁸ = 165666810037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165666810233) 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, 741296 + ... + 938537.

It is an arithmetic number, because the mean of its divisors is an integer number (41417147187).

Almost surely, 2^165666810293 is an apocalyptic number.

It is an amenable number.

165666810293 is a deficient number, since it is larger than the sum of its proper divisors (1778455).

165666810293 is an equidigital number, since it uses as much as digits as its factorization.

165666810293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778454.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 165666810293 in words is "one hundred sixty-five billion, six hundred sixty-six million, eight hundred ten thousand, two hundred ninety-three".