165667823 has 2 divisors, whose sum is σ = 165667824. Its totient is φ = 165667822.

The previous prime is 165667787. The next prime is 165667847. The reversal of 165667823 is 328766561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165667823 - 2¹⁰ = 165666799 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165667123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82833911 + 82833912.

It is an arithmetic number, because the mean of its divisors is an integer number (82833912).

Almost surely, 2^165667823 is an apocalyptic number.

165667823 is a deficient number, since it is larger than the sum of its proper divisors (1).

165667823 is an equidigital number, since it uses as much as digits as its factorization.

165667823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 165667823 is about 12871.2013036857. The cubic root of 165667823 is about 549.2196349038.

It can be divided in two parts, 16566 and 7823, that added together give a cube (24389 = 29³).

The spelling of 165667823 in words is "one hundred sixty-five million, six hundred sixty-seven thousand, eight hundred twenty-three".