165216287 has 2 divisors, whose sum is σ = 165216288. Its totient is φ = 165216286.

The previous prime is 165216263. The next prime is 165216349. The reversal of 165216287 is 782612561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165216287 - 2⁸ = 165216031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165216287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165216187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82608143 + 82608144.

It is an arithmetic number, because the mean of its divisors is an integer number (82608144).

Almost surely, 2^165216287 is an apocalyptic number.

165216287 is a deficient number, since it is larger than the sum of its proper divisors (1).

165216287 is an equidigital number, since it uses as much as digits as its factorization.

165216287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 165216287 is about 12853.6487815717. The cubic root of 165216287 is about 548.7202056249.

The spelling of 165216287 in words is "one hundred sixty-five million, two hundred sixteen thousand, two hundred eighty-seven".