165600091 has 2 divisors, whose sum is σ = 165600092. Its totient is φ = 165600090.

The previous prime is 165600089. The next prime is 165600101. The reversal of 165600091 is 190006561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165600091 - 2¹ = 165600089 is a prime.

Together with 165600089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165600041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82800045 + 82800046.

It is an arithmetic number, because the mean of its divisors is an integer number (82800046).

Almost surely, 2^165600091 is an apocalyptic number.

165600091 is a deficient number, since it is larger than the sum of its proper divisors (1).

165600091 is an equidigital number, since it uses as much as digits as its factorization.

165600091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 165600091 is about 12868.5698894632. The cubic root of 165600091 is about 549.1447766435.

The spelling of 165600091 in words is "one hundred sixty-five million, six hundred thousand, ninety-one".