161155160073 has 6 divisors (see below), whose sum is σ = 232779675674. Its totient is φ = 107436773376.

The previous prime is 161155160039. The next prime is 161155160113. The reversal of 161155160073 is 370061551161.

161155160073 is a `hidden beast` number, since 1 + 61 + 15 + 516 + 0 + 0 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159162698304 + 1992461769 = 398952^2 + 44637^2 .

It is not a de Polignac number, because 161155160073 - 2¹⁰ = 161155159049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161155110073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8953064440 + ... + 8953064457.

Almost surely, 2^161155160073 is an apocalyptic number.

It is an amenable number.

161155160073 is a deficient number, since it is larger than the sum of its proper divisors (71624515601).

161155160073 is a wasteful number, since it uses less digits than its factorization.

161155160073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17906128903 (or 17906128900 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The spelling of 161155160073 in words is "one hundred sixty-one billion, one hundred fifty-five million, one hundred sixty thousand, seventy-three".