161840832544665 has 12 divisors (see below), whose sum is σ = 280524109744164. Its totient is φ = 86315110690464.

The previous prime is 161840832544649. The next prime is 161840832544669. The reversal of 161840832544665 is 566445238048161.

161840832544665 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 4 + 0 + 83 + 2 + 544 + 6 + 6 + 5 = 666.

161840832544665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 93369394630656 + 68471437914009 = 9662784^2 + 8274747^2 .

It is not a de Polignac number, because 161840832544665 - 2⁴ = 161840832544649 is a prime.

It is a super-3 number, since 3×161840832544665³ (a number of 44 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161840832544669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1798231472674 + ... + 1798231472763.

It is an arithmetic number, because the mean of its divisors is an integer number (23377009145347).

Almost surely, 2^{161840832544665} is an apocalyptic number.

161840832544665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161840832544665 is a deficient number, since it is larger than the sum of its proper divisors (118683277199499).

161840832544665 is a wasteful number, since it uses less digits than its factorization.

161840832544665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596462945448 (or 3596462945445 counting only the distinct ones).

The product of its (nonzero) digits is 132710400, while the sum is 63.

The spelling of 161840832544665 in words is "one hundred sixty-one trillion, eight hundred forty billion, eight hundred thirty-two million, five hundred forty-four thousand, six hundred sixty-five".