165665511149 has 2 divisors, whose sum is σ = 165665511150. Its totient is φ = 165665511148.

The previous prime is 165665511101. The next prime is 165665511181. The reversal of 165665511149 is 941115566561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157059238249 + 8606272900 = 396307^2 + 92770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165665511149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165665511097 and 165665511106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165665514149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82832755574 + 82832755575.

It is an arithmetic number, because the mean of its divisors is an integer number (82832755575).

Almost surely, 2^165665511149 is an apocalyptic number.

It is an amenable number.

165665511149 is a deficient number, since it is larger than the sum of its proper divisors (1).

165665511149 is an equidigital number, since it uses as much as digits as its factorization.

165665511149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 50.

The spelling of 165665511149 in words is "one hundred sixty-five billion, six hundred sixty-five million, five hundred eleven thousand, one hundred forty-nine".