165884016553 has 2 divisors, whose sum is σ = 165884016554. Its totient is φ = 165884016552.

The previous prime is 165884016533. The next prime is 165884016569. The reversal of 165884016553 is 355610488561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163060900864 + 2823115689 = 403808^2 + 53133^2 .

It is a cyclic number.

It is not a de Polignac number, because 165884016553 - 2⁵ = 165884016521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165884016553.

It is not a weakly prime, because it can be changed into another prime (165884016523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82942008276 + 82942008277.

It is an arithmetic number, because the mean of its divisors is an integer number (82942008277).

Almost surely, 2^165884016553 is an apocalyptic number.

It is an amenable number.

165884016553 is a deficient number, since it is larger than the sum of its proper divisors (1).

165884016553 is an equidigital number, since it uses as much as digits as its factorization.

165884016553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456000, while the sum is 52.

The spelling of 165884016553 in words is "one hundred sixty-five billion, eight hundred eighty-four million, sixteen thousand, five hundred fifty-three".