161208585601 has 4 divisors (see below), whose sum is σ = 184238383552. Its totient is φ = 138178787652.

The previous prime is 161208585599. The next prime is 161208585611. The reversal of 161208585601 is 106585802161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161208585601 - 2¹ = 161208585599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161208585611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11514898965 + ... + 11514898978.

It is an arithmetic number, because the mean of its divisors is an integer number (46059595888).

Almost surely, 2^161208585601 is an apocalyptic number.

It is an amenable number.

161208585601 is a deficient number, since it is larger than the sum of its proper divisors (23029797951).

161208585601 is an equidigital number, since it uses as much as digits as its factorization.

161208585601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23029797950.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 161208585601 in words is "one hundred sixty-one billion, two hundred eight million, five hundred eighty-five thousand, six hundred one".