165501656729 has 2 divisors, whose sum is σ = 165501656730. Its totient is φ = 165501656728.

The previous prime is 165501656597. The next prime is 165501656767. The reversal of 165501656729 is 927656105561.

It is a happy number.

165501656729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155825983504 + 9675673225 = 394748^2 + 98365^2 .

It is a cyclic number.

It is not a de Polignac number, because 165501656729 - 2¹⁶ = 165501591193 is a prime.

It is not a weakly prime, because it can be changed into another prime (165501655729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82750828364 + 82750828365.

It is an arithmetic number, because the mean of its divisors is an integer number (82750828365).

Almost surely, 2^165501656729 is an apocalyptic number.

It is an amenable number.

165501656729 is a deficient number, since it is larger than the sum of its proper divisors (1).

165501656729 is an equidigital number, since it uses as much as digits as its factorization.

165501656729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402000, while the sum is 53.

The spelling of 165501656729 in words is "one hundred sixty-five billion, five hundred one million, six hundred fifty-six thousand, seven hundred twenty-nine".