165868601 has 2 divisors, whose sum is σ = 165868602. Its totient is φ = 165868600.

The previous prime is 165868589. The next prime is 165868627. The reversal of 165868601 is 106868561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116532025 + 49336576 = 10795^2 + 7024^2 .

It is a cyclic number.

It is not a de Polignac number, because 165868601 - 2¹⁴ = 165852217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165868691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82934300 + 82934301.

It is an arithmetic number, because the mean of its divisors is an integer number (82934301).

Almost surely, 2^165868601 is an apocalyptic number.

It is an amenable number.

165868601 is a deficient number, since it is larger than the sum of its proper divisors (1).

165868601 is an equidigital number, since it uses as much as digits as its factorization.

165868601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 165868601 is about 12878.9984470843. The cubic root of 165868601 is about 549.4414174661.

The spelling of 165868601 in words is "one hundred sixty-five million, eight hundred sixty-eight thousand, six hundred one".