161205571105 has 8 divisors (see below), whose sum is σ = 193452129000. Its totient is φ = 128960827776.

The previous prime is 161205570961. The next prime is 161205571183. The reversal of 161205571105 is 501175502161.

It can be written as a sum of positive squares in 4 ways, for example, as 29168540944 + 132037030161 = 170788^2 + 363369^2 .

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 161205571105 - 2¹³ = 161205562913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249870 + ... + 620359.

It is an arithmetic number, because the mean of its divisors is an integer number (24181516125).

Almost surely, 2^161205571105 is an apocalyptic number.

It is an amenable number.

161205571105 is a deficient number, since it is larger than the sum of its proper divisors (32246557895).

161205571105 is an equidigital number, since it uses as much as digits as its factorization.

161205571105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907283.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 161205571105 in words is "one hundred sixty-one billion, two hundred five million, five hundred seventy-one thousand, one hundred five".