165002171489 has 2 divisors, whose sum is σ = 165002171490. Its totient is φ = 165002171488.

The previous prime is 165002171473. The next prime is 165002171527. The reversal of 165002171489 is 984171200561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147788731489 + 17213440000 = 384433^2 + 131200^2 .

It is a cyclic number.

It is not a de Polignac number, because 165002171489 - 2⁴ = 165002171473 is a prime.

It is not a weakly prime, because it can be changed into another prime (165002171449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82501085744 + 82501085745.

It is an arithmetic number, because the mean of its divisors is an integer number (82501085745).

Almost surely, 2^165002171489 is an apocalyptic number.

It is an amenable number.

165002171489 is a deficient number, since it is larger than the sum of its proper divisors (1).

165002171489 is an equidigital number, since it uses as much as digits as its factorization.

165002171489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 165002171489 in words is "one hundred sixty-five billion, two million, one hundred seventy-one thousand, four hundred eighty-nine".