165626646161 has 2 divisors, whose sum is σ = 165626646162. Its totient is φ = 165626646160.

The previous prime is 165626646139. The next prime is 165626646203. The reversal of 165626646161 is 161646626561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144856360000 + 20770286161 = 380600^2 + 144119^2 .

It is a cyclic number.

It is not a de Polignac number, because 165626646161 - 2²² = 165622451857 is a prime.

It is not a weakly prime, because it can be changed into another prime (165626646131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82813323080 + 82813323081.

It is an arithmetic number, because the mean of its divisors is an integer number (82813323081).

Almost surely, 2^165626646161 is an apocalyptic number.

It is an amenable number.

165626646161 is a deficient number, since it is larger than the sum of its proper divisors (1).

165626646161 is an equidigital number, since it uses as much as digits as its factorization.

165626646161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 50.

The spelling of 165626646161 in words is "one hundred sixty-five billion, six hundred twenty-six million, six hundred forty-six thousand, one hundred sixty-one".