161580539673 has 24 divisors (see below), whose sum is σ = 270112544000. Its totient is φ = 91162977984.

The previous prime is 161580539671. The next prime is 161580539677. The reversal of 161580539673 is 376935085161.

161580539673 is a `hidden beast` number, since 1 + 6 + 1 + 580 + 53 + 9 + 6 + 7 + 3 = 666.

It is not a de Polignac number, because 161580539673 - 2¹ = 161580539671 is a prime.

It is a super-2 number, since 2×161580539673² (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 (161580539671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16227748 + ... + 16237701.

Almost surely, 2^161580539673 is an apocalyptic number.

It is an amenable number.

161580539673 is a deficient number, since it is larger than the sum of its proper divisors (108532004327).

161580539673 is a wasteful number, since it uses less digits than its factorization.

161580539673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32465541 (or 32465538 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 161580539673 in words is "one hundred sixty-one billion, five hundred eighty million, five hundred thirty-nine thousand, six hundred seventy-three".