165645827 has 2 divisors, whose sum is σ = 165645828. Its totient is φ = 165645826.

The previous prime is 165645811. The next prime is 165645859. The reversal of 165645827 is 728546561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165645827 - 2⁴ = 165645811 is a prime.

It is not a weakly prime, because it can be changed into another prime (165645877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82822913 + 82822914.

It is an arithmetic number, because the mean of its divisors is an integer number (82822914).

Almost surely, 2^165645827 is an apocalyptic number.

165645827 is a deficient number, since it is larger than the sum of its proper divisors (1).

165645827 is an equidigital number, since it uses as much as digits as its factorization.

165645827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 44.

The square root of 165645827 is about 12870.3468096241. The cubic root of 165645827 is about 549.1953268848.

The spelling of 165645827 in words is "one hundred sixty-five million, six hundred forty-five thousand, eight hundred twenty-seven".