161207142205 has 8 divisors (see below), whose sum is σ = 193549705272. Its totient is φ = 128898290688.

The previous prime is 161207142181. The next prime is 161207142293. The reversal of 161207142205 is 502241702161.

161207142205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 74246440324 + 86960701881 = 272482^2 + 294891^2 .

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 161207142205 - 2¹⁹ = 161206617917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8417364 + ... + 8436493.

It is an arithmetic number, because the mean of its divisors is an integer number (24193713159).

Almost surely, 2^161207142205 is an apocalyptic number.

It is an amenable number.

161207142205 is a deficient number, since it is larger than the sum of its proper divisors (32342563067).

161207142205 is a wasteful number, since it uses less digits than its factorization.

161207142205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16855775.

The product of its (nonzero) digits is 6720, while the sum is 31.

Adding to 161207142205 its reverse (502241702161), we get a palindrome (663448844366).

The spelling of 161207142205 in words is "one hundred sixty-one billion, two hundred seven million, one hundred forty-two thousand, two hundred five".