165138087029 has 2 divisors, whose sum is σ = 165138087030. Its totient is φ = 165138087028.

The previous prime is 165138086963. The next prime is 165138087043. The reversal of 165138087029 is 920780831561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139724944804 + 25413142225 = 373798^2 + 159415^2 .

It is a cyclic number.

It is not a de Polignac number, because 165138087029 - 2¹² = 165138082933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165138087629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82569043514 + 82569043515.

It is an arithmetic number, because the mean of its divisors is an integer number (82569043515).

Almost surely, 2^165138087029 is an apocalyptic number.

It is an amenable number.

165138087029 is a deficient number, since it is larger than the sum of its proper divisors (1).

165138087029 is an equidigital number, since it uses as much as digits as its factorization.

165138087029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 165138087029 in words is "one hundred sixty-five billion, one hundred thirty-eight million, eighty-seven thousand, twenty-nine".