165510601065961 has 2 divisors, whose sum is σ = 165510601065962. Its totient is φ = 165510601065960.

The previous prime is 165510601065949. The next prime is 165510601066049. The reversal of 165510601065961 is 169560106015561.

165510601065961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139987705089600 + 25522895976361 = 11831640^2 + 5052019^2 .

It is an emirp because it is prime and its reverse (169560106015561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165510601065961 - 2⁴⁵ = 130326228977129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165510601065899 and 165510601065908.

It is not a weakly prime, because it can be changed into another prime (165510601065661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82755300532980 + 82755300532981.

It is an arithmetic number, because the mean of its divisors is an integer number (82755300532981).

Almost surely, 2^{165510601065961} is an apocalyptic number.

It is an amenable number.

165510601065961 is a deficient number, since it is larger than the sum of its proper divisors (1).

165510601065961 is an equidigital number, since it uses as much as digits as its factorization.

165510601065961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 52.

The spelling of 165510601065961 in words is "one hundred sixty-five trillion, five hundred ten billion, six hundred one million, sixty-five thousand, nine hundred sixty-one".