165542741681 has 8 divisors (see below), whose sum is σ = 169155822528. Its totient is φ = 161965258000.

The previous prime is 165542741653. The next prime is 165542741717. The reversal of 165542741681 is 186147245561.

165542741681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165542741681 - 2³⁰ = 164468999857 is a prime.

It is a super-2 number, since 2×165542741681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165542731681) 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 in 7 ways as a sum of consecutive naturals, for example, 8889890 + ... + 8908491.

It is an arithmetic number, because the mean of its divisors is an integer number (21144477816).

Almost surely, 2^165542741681 is an apocalyptic number.

It is an amenable number.

165542741681 is a deficient number, since it is larger than the sum of its proper divisors (3613080847).

165542741681 is a wasteful number, since it uses less digits than its factorization.

165542741681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17798583.

The product of its digits is 1612800, while the sum is 50.

The spelling of 165542741681 in words is "one hundred sixty-five billion, five hundred forty-two million, seven hundred forty-one thousand, six hundred eighty-one".