165987763 has 2 divisors, whose sum is σ = 165987764. Its totient is φ = 165987762.

The previous prime is 165987749. The next prime is 165987817. The reversal of 165987763 is 367789561.

It is a weak prime.

It is an emirp because it is prime and its reverse (367789561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165987763 - 2²¹ = 163890611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165987763.

It is not a weakly prime, because it can be changed into another prime (165987713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82993881 + 82993882.

It is an arithmetic number, because the mean of its divisors is an integer number (82993882).

Almost surely, 2^165987763 is an apocalyptic number.

165987763 is a deficient number, since it is larger than the sum of its proper divisors (1).

165987763 is an equidigital number, since it uses as much as digits as its factorization.

165987763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 52.

The square root of 165987763 is about 12883.6238302738. The cubic root of 165987763 is about 549.5729610801.

The spelling of 165987763 in words is "one hundred sixty-five million, nine hundred eighty-seven thousand, seven hundred sixty-three".