165111351744661 has 16 divisors (see below), whose sum is σ = 190565022067200. Its totient is φ = 140126108018688.

The previous prime is 165111351744653. The next prime is 165111351744733. The reversal of 165111351744661 is 166447153111561.

165111351744661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165111351744661 - 2³ = 165111351744653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165111351744599 and 165111351744608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165111351744161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75716125 + ... + 77866258.

It is an arithmetic number, because the mean of its divisors is an integer number (11910313879200).

Almost surely, 2^{165111351744661} is an apocalyptic number.

It is an amenable number.

165111351744661 is a deficient number, since it is larger than the sum of its proper divisors (25453670322539).

165111351744661 is a wasteful number, since it uses less digits than its factorization.

165111351744661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153583908.

The product of its digits is 1814400, while the sum is 52.

The spelling of 165111351744661 in words is "one hundred sixty-five trillion, one hundred eleven billion, three hundred fifty-one million, seven hundred forty-four thousand, six hundred sixty-one".