165500087 has 2 divisors, whose sum is σ = 165500088. Its totient is φ = 165500086.

The previous prime is 165500081. The next prime is 165500107. The reversal of 165500087 is 780005561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165500087 - 2¹² = 165495991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165500081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82750043 + 82750044.

It is an arithmetic number, because the mean of its divisors is an integer number (82750044).

Almost surely, 2^165500087 is an apocalyptic number.

165500087 is a deficient number, since it is larger than the sum of its proper divisors (1).

165500087 is an equidigital number, since it uses as much as digits as its factorization.

165500087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 165500087 is about 12864.6837116192. The cubic root of 165500087 is about 549.0342136357.

The spelling of 165500087 in words is "one hundred sixty-five million, five hundred thousand, eighty-seven".