161605560161588 has 6 divisors (see below), whose sum is σ = 282809730282786. Its totient is φ = 80802780080792.

The previous prime is 161605560161569. The next prime is 161605560161603. The reversal of 161605560161588 is 885161065506161.

It can be written as a sum of positive squares in only one way, i.e., 159815562345124 + 1789997816464 = 12641818^2 + 1337908^2 .

It is a super-2 number, since 2×161605560161588² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20200695020195 + ... + 20200695020202.

It is an arithmetic number, because the mean of its divisors is an integer number (47134955047131).

Almost surely, 2^{161605560161588} is an apocalyptic number.

It is an amenable number.

161605560161588 is a deficient number, since it is larger than the sum of its proper divisors (121204170121198).

161605560161588 is a wasteful number, since it uses less digits than its factorization.

161605560161588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40401390040401 (or 40401390040399 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 59.

The spelling of 161605560161588 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred sixty million, one hundred sixty-one thousand, five hundred eighty-eight".