165646673 has 2 divisors, whose sum is σ = 165646674. Its totient is φ = 165646672.

The previous prime is 165646643. The next prime is 165646681. The reversal of 165646673 is 376646561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162996289 + 2650384 = 12767^2 + 1628^2 .

It is an emirp because it is prime and its reverse (376646561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165646673 is a prime.

It is not a weakly prime, because it can be changed into another prime (165646603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82823336 + 82823337.

It is an arithmetic number, because the mean of its divisors is an integer number (82823337).

Almost surely, 2^165646673 is an apocalyptic number.

It is an amenable number.

165646673 is a deficient number, since it is larger than the sum of its proper divisors (1).

165646673 is an equidigital number, since it uses as much as digits as its factorization.

165646673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 44.

The square root of 165646673 is about 12870.3796758293. The cubic root of 165646673 is about 549.1962618484.

The spelling of 165646673 in words is "one hundred sixty-five million, six hundred forty-six thousand, six hundred seventy-three".