165673817 has 2 divisors, whose sum is σ = 165673818. Its totient is φ = 165673816.

The previous prime is 165673811. The next prime is 165673831. The reversal of 165673817 is 718376561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100080016 + 65593801 = 10004^2 + 8099^2 .

It is a cyclic number.

It is not a de Polignac number, because 165673817 - 2⁴ = 165673801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165673811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82836908 + 82836909.

It is an arithmetic number, because the mean of its divisors is an integer number (82836909).

Almost surely, 2^165673817 is an apocalyptic number.

It is an amenable number.

165673817 is a deficient number, since it is larger than the sum of its proper divisors (1).

165673817 is an equidigital number, since it uses as much as digits as its factorization.

165673817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 165673817 is about 12871.4341469783. The cubic root of 165673817 is about 549.2262585654.

The spelling of 165673817 in words is "one hundred sixty-five million, six hundred seventy-three thousand, eight hundred seventeen".