165917893 has 2 divisors, whose sum is σ = 165917894. Its totient is φ = 165917892.

The previous prime is 165917887. The next prime is 165917897. The reversal of 165917893 is 398719561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100340289 + 65577604 = 10017^2 + 8098^2 .

It is a cyclic number.

It is not a de Polignac number, because 165917893 - 2¹³ = 165909701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165917897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82958946 + 82958947.

It is an arithmetic number, because the mean of its divisors is an integer number (82958947).

Almost surely, 2^165917893 is an apocalyptic number.

It is an amenable number.

165917893 is a deficient number, since it is larger than the sum of its proper divisors (1).

165917893 is an equidigital number, since it uses as much as digits as its factorization.

165917893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 165917893 is about 12880.9119630560. The cubic root of 165917893 is about 549.4958388249.

The spelling of 165917893 in words is "one hundred sixty-five million, nine hundred seventeen thousand, eight hundred ninety-three".