161601220201 has 16 divisors (see below), whose sum is σ = 176944622400. Its totient is φ = 146999966400.

The previous prime is 161601220177. The next prime is 161601220211. The reversal of 161601220201 is 102022106161.

161601220201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161601220201 - 2⁵ = 161601220169 is a prime.

It is a super-2 number, since 2×161601220201² (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 (161601220211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710455 + ... + 909916.

It is an arithmetic number, because the mean of its divisors is an integer number (11059038900).

Almost surely, 2^161601220201 is an apocalyptic number.

It is an amenable number.

161601220201 is a deficient number, since it is larger than the sum of its proper divisors (15343402199).

161601220201 is a wasteful number, since it uses less digits than its factorization.

161601220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620600.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 161601220201 its reverse (102022106161), we get a palindrome (263623326362).

The spelling of 161601220201 in words is "one hundred sixty-one billion, six hundred one million, two hundred twenty thousand, two hundred one".